Contents
5 Details on Level 1b Product Data Set Records
The Level 1b products of the Swarm mission contains time-series of quality-screen, calibrated, and corrected measurements given in physical, SI units in geo-localized reference frames. Level 1b products are provided individually for each of the three satellites Swarm A, Swarm B, and Swarm C on a daily basis. The Swarm Level 1b naming convention can be illustrated in the following example:
Example illustrating the filename of the Swarm A Level 1b low-rate magnetic product MAGx_LR from 23 February 2013.
The following table identifies the Level 1b Products for Swarm. The Products with a daily period are provided covering one day of observations, i.e. 0:00:00 through 24:00:00 (UTC or GPS in case of RINEX files). The estimated sizes do not include header file information.
| File Type | File Description | Rate | Period | Format | Extension |
Estimated Size
[Mbytes/file] |
| MAGX_HR_1B | Magnetic vector data, high rate | ~50 Hz | daily | CDF | .cdf | 340 |
| MAGX_LR_1B | Magnetic data, low rate | 1 Hz | daily | CDF | .cdf | 11 |
| MAGX_CA_lB | Magnetic Calibration data | 1 Hz | daily | CDF | .cdf | 11 |
| MAGXMAN_1B | Magnetic Calibration Manoeuvre report | On demand | - | CDF | .cdf | 10-3 |
| EFIX_LP_1B | Plasma data | 2 Hz | daily | CDF | .cdf | 5.6 |
| EFIXLPI_1B | Interpolated Plasma data | 1 Hz | daily | CDF | .cdf | 3.0 |
| LP_X_CA_1B | Langmuir Probe offset calibration data | 6 h | daily | CDF | .cdf | 10-3 |
| MODX_SC_1B | Position and velocity | 1 Hz | daily | ASCII | .sp3 | 20.0 |
| STRXATT_1B | Attitude of spacecraft | 1 Hz | daily | CDF | .cdf | 2.7 |
| GPSXNAV_1B | On-board GPSR navigational solution | 1 Hz | daily | ASCII | .sp3 | 13 |
| GPSX_RO_1B | GPS RINEX Observation data | 0.1 / 1 Hz | daily | ASCII | .rnx | 8.8 or 88 |
| GPSX_RN_1B | GPS RINEX Navigation data | 2 h | daily | ASCII | .rnx | 0.25 |
| ACCX_PR_1B | Pre-processed ACC data | 1 Hz | daily | CDF | .cdf | 6 |
| SC_XDYN_1B | Auxiliary data for precise orbit determination and acceleration modelling | 1 Hz | daily | CDF | .cdf | 3.7 |
| ASMXAUX_1B | ASM auxiliary data | 50 Hz | daily | CDF | .cdf | 20 |
| VFMXAUX_1B | VFM auxiliary data | 50 Hz | daily | CDF | .cdf | 40 |
Table 1: Swarm Level 1b Products List
The primary Level 1b Products containing measurements of the magnetic field are MAGX_HR_1B and MAGX_LR_1B. They are largely identical with respect to the elements of the products, but the sampling rate of the data is different. MAGX_HR_1B is provided at the basic sampling rate of the vector magnetometer instrument (VFM), 50 Hz. This product is called Mag-H for short and is described in MAGX_HR_1B Product. The MAGX_LR_1B product contains magnetic vector data at a reduced sampling rate of 1 Hz plus the measurements of the magnetic field intensity from the scalar magnetometer (ASM) and is termed Mag-L for short. This is described in MAGX_LR_1B Product.
The magnetic vector elements of the MAGX_HR_1B and MAGX_LR_1B Products are provided in two reference frames: the VFM instrument frame and the orbit related NEC (North-East-Centre) frame. See [AD-7] for further details on these frames.
The magnetic Level 1b product named MAGX_CA_lB (Mag-C for short) contains the data used for the monitoring and estimation of the temporal VFM calibration parameters. Its content is described in MAGX_CA_1B Product. The temporal VFM parameters themselves are contained in an auxiliary data set, TCF.VFM, and stored in the magnetic products listed here. This Data Set is described in TCF.VFM Data Set.
The MAGXMAN_1B Product contains the report of the TCF.VFM records, their differences, and threshold checks when a magnetic calibration manouevre has been performed. See MAGXMAN_1B Product.
There are two additional magnetic products, ASMXAUX_1B and VFMXAUX_1B, containing the magnetic stray fields of the S/C at the ASM respectively the VFM sensor positions. They are used during special campaigns, e.g. when the ASM instrument is running in the special burst mode or vector mode configuration. Their contents are listed in ASMXAUX_1B Product and VFMXAUX_1B Product.
Early in the Swarm Mission it was recognized that the vector measurements on-board the Swarm spacecrafts suffered from an unexpected magnetic disturbance of varying strength and direction. Such disturbances are highly correlated with the Sun incident angle with respect to the spacecraft and are manifested as scalar residuals between the ASM and VFM data. The disturbance has been modelled as described in this technical note. Implemented from Product Baseline 04, the calibration parameters for the vector measurements estimated on a daily basis are replaced by the co-estimated calibration adjustment parameters, and the magnetic vector disturbance, denoted with dBSun and considered as a stray field vector, is then applied. The corrected data presents such additional parameter, dBSun. MAGx_CA_1B also contains the pre-calibrated (i.e. without any stray field correction applied) VFM magnetic data ("Bpre") and the reference angles "alpha" and "beta" which represent the Spacecraft to Sun attitude angles.
The MAGX_HR_1B Product contains magnetic vector data at 50 Hz rate. The time instants of the data are determined by the VFM instrument samplings. No interpolation of the magnetic data is performed, neither to shift the measurements in time nor to fill any gaps in the VFM source data. The measurement data set record of the MAGX_HR_1B Product is described in Table 2. See also Mag-H Data Set Record, MDR_MAG_HR.
| t | Time, UTC |
| r | Position of VFM sensor in ITRF, spherical geocentric coordinates |
| BVFM | Magnetic field vector, VFM frame |
| BNEC |
Magnetic field vector, NEC frame.
Note: this is set to zero if no attitude information is available (Flagsq = 255) |
| dBSun | Sun induced stray magnetic field correction vector subtracted from measurements, VFM frame (implemented from Product Baseline 04). |
| dBAOCS | AOCS magneto-torquer stray magnetic field correction vector subtracted from measurements, VFM frame. |
| dBother | Stray magnetic field correction vector of all other sources subtracted from measurements, VFM frame. |
| Berror |
Error estimate on magnetic field vector, VFM frame.
Accounts for errors of commissioning including:
For further details please consult SW-TN-DTU-GS-016 |
| qNEC?CRF | Rotation from NEC to Common Reference Frame (CRF) |
| Atterror |
Error estimate on attitude information.
Includes effects such as number of STR camera heads supplying attitude information, possible discrepancies in provided attitude information from several heads, lack of STR attitude information (i.e. the attitude used for computing BNEC is obtained by interpolation over longer arcs of S/C motion), etc. |
| FlagsB | Flags related to the magnetic field vector measurement |
| Flagsq | Flags related to the attitude data |
| FlagsPlatform | Flags related to the S/C platform – Bus and AOCS telemetry, position accuracy |
Table 2: Measurement Data Set Record of MAGX_HR_1B Product
The MAGX_LR_1B Product contains magnetic vector and scalar data at 1 Hz rate. The S/C data are processed to provide MAGX_LR_1B data at exact UTC seconds, i.e. both VFM vector and ASM scalar data are interpolated to yield these data. Hence, small gaps in the VFM or ASM data need not cause gaps in the product as the gaps may be filled by this interpolation. Any gaps, however, will have an impact on the error estimate of the associated product element. The measurement data set record of the MAGX_LR_1B Product is described in Table 3. See also Mag-L Data Set Record, MDR_MAG_LR.
| t | Time, UTC |
| r | Position of VFM sensor in ITRF, spherical geocentric coordinates |
| F | Magnetic field intensity ("scalar magnetic field") |
| dFAOCS | AOCS magneto-torquer stray magnetic field intensity subtracted from scalar measurements |
| dFother | Stray magnetic field intensity of all other sources subtracted from scalar measurements |
| Ferror |
Error estimate on magnetic field intensity.
Accounts for errors of commissioning including:
For further details please consult SW-TN-DTU-GS-016 |
| BVFM |
Magnetic field vector, VFM frame.
Note: this is set to zero if insufficient vector magnetometer measurements are available (FlagsB = 255) |
| BNEC |
Magnetic field vector, NEC frame.
Note: this is set to zero if insufficient vector magnetometer or attitude measurements are available (FlagsB= 255 or Flagsq = 255) |
| dBSun | Sun induced stray magnetic field correction vector subtracted from measurements, VFM frame (implemented from Product Baseline 04). |
| dBAOCS | AOCS magneto-torquer stray magnetic field correction vector subtracted from vector measurements, VFM frame. |
| dBother | Stray magnetic field correction vector of all other sources subtracted from vector measurements, VFM frame. |
| Berror |
Error estimate on magnetic field vector, VFM frame.
Accounts for errors of commissioning including:
For further details please consult SW-TN-DTU-GS-016 |
| QNEC?CRF | Rotation from NEC to Common Reference Frame (CRF) |
| Atterror |
Error estimate on attitude information.
Includes effects such as number of STR camera heads supplying attitude information, possible discrepancies in provided attitude information from several heads, lack of STR attitude information (i.e. the attitude used for computing BNEC is obtained by interpolation over longer arcs of S/C motion), etc. |
| FlagsF | Flags related to the magnetic field intensity measurement |
| FlagsB | Flags related to the magnetic field vector measurement |
| Flagsq | Flags related to the attitude data |
| FlagsPlatform | Flags related to the S/C platform – Bus and AOCS telemetry, position accuracy |
| ASM_ Freq_Dev | Deviation of actual ASM frequency calibration data from screened and filtered value |
Table 3: Measurement Data Set Record of MAGX_LR_1B Product
The MAGX_CA_1B Product contains magnetic vector and scalar data for monitoring, TCF.VFM verification, and calibration purposes. It contains raw as well as processed VFM vector measurements, VFM temperatures, and fully converted and corrected ASM measurements at 1 Hz rate. This is essentially the data used for the TCF.VFM estimation but including also the raw VFM data. The measurement data set record of the MAGX_CA_1B Product is described in Table 4. See also Mag-C Data Set Record, MDR_MAG_CA.
| t | Time, UTC |
| r | Position in ITRF, spherical geocentric coordinates |
| F | Converted and corrected magnetic field intensity from ASM – not adjusted for filter group delay |
| dFAOCS | Stray magnetic field intensity correction of AOCS magneto-torquers |
| dFother | Stray magnetic field intensity correction of all other sources. |
| Ferror |
Error estimate on magnetic field intensity.
Accounts for errors of commissioning including:
For further details please consult SW-TN-DTU-GS-016 observing that Ferror = F(3)err |
| FVFM | Converted, corrected, ASM-filtered and interpolated magnetic field intensity from VFM – also corrected for ASM filter group delay |
| dtVFM | Time offset, dtVFM = tout,VFMnear – tshifted, where tout,VFMnear is the time-stamp of the VFM sample nearest t shifted according to the ASM filter group delay (tshifted ˜ t - 1.2 s) |
| B | Converted and corrected magnetic field vector from VFM at time tshifted+dtVFM |
| dBSun | Magnetic stray field vector of Sun induced stray field at VFM sensor at time tshifted+dtVFM (implemented from Product Baseline 04) |
| dBAOCS | Magnetic stray field vector of AOCS magneto-torquer at VFM sensor at time tshifted+dtVFM |
| dBother | Magnetic stray field vector of all other sources at VFM sensor at time tshifted+dtVFM |
| Bpre | Pre-calibrated VFM magnetic field vector, VFM frame at time tshifted+dtVFM (implemented from Product Baseline 04) |
| EUVFM | Raw VFM measurement at time tshifted+dtVFM |
| TCDC | Temperature of VFM CDC at time tshifted+dtVFM |
| TCSC | Temperature of VFM CSC at time tshifted+dtVFM |
| TEU | Temperature of VFM electronic unit at time tshifted+dtVFM |
| alpha | Solar inclination angle, rotation about -y axis, S/C frame at time tshifted+dtVFM (implemented from Product Baseline 04) |
| beta | Solar inclination angle, angleto -y axis, S/C frame at time tshifted+dtVFM (implemented from Product Baseline 04) |
Table 4: Measurement Data Set Record of MAGX_CA_1B Product
The TCF.VFM Data Set contains the parameters of the model of the temporal changes in the VFM instrument. The TCF.VFM Data Set Record shall be included in all three magnetic products: MAGX_HR_1B, MAGX_LR_1B, and MAGX_CA_1B. This data set contains one record per day and is described in Table 5 below. See also TCF.VFM Parameter Data Set Record, ASM_VFM_IC .
| trange | Time interval of the VFM measurements used in estimating the parameters |
| DPU_id | Specifies the active VFM DPU (Data Processing Unit) identifier |
| Bias | Vector of offsets |
| Scale | Vector of scale values |
| Non-orth | Vector of non-orthogonality angles |
| Samples | Number of samples used to estimate the parameters |
| Rms | Weighted rms (root-mean-square) value of obtained misfit between VFM and ASM measurements |
| Cov | Covariances of the estimated parameters |
| Wscale | Log10 values of actual weigths of a-priori parameters (affected by e.g. maneouvers) |
Table 5: TCF.VFM Data Set Record
The MAGXMAN_1B Product contains a report on the VFM temporal parameters in response to a Magnetic Calibration manouevre stored in a VFM_MAN_RP Data Set (Table 6 below) as well as two TCF.VFM Data Set records (Table 5), the one from just before the manouevre and the one of the day of the manouevre.
| Delta_bias | Vector of changes in offsets |
| delta_scale | Vector of changes in scale values |
| delta_non-orth | Vector of changes in non-orthogonality angles |
| Threshold1_bias | Threshold 1 value for biases |
| Threshold1_scale' | Threshold 1 value for scale values |
| Threshold1_non-orth | Threshold 1 value for non-orthogonality angles |
| Threshold2_bias | Threshold 2 value for biases |
| Threshold2_scale | Threshold 2 value for scale values |
| Threshold2_non-orth | Threshold 2 value for non-orthogonality angles |
| Messages | Messages generated by the magnetic calibration manouevre processor |
Table 6: MAGXMAN_1B VFM_MAN_RP Data Set Record
The ASMXAUX_1B Product contains detailed information on the S/C magnetic stray fields at the ASM sensor position. The data are provided at 50 Hz at the time-instants of the VFM measurements (for internal practical purposes); the stray field vectors are provided in the ASM sensor frame. The measurement data set record of the ASMXAUX_1B Product is described in Table 7. See also ASMXAUX_1B Data Set Record, MDR_ASMAUX.
| t | Time, UTC |
| dBAOCS | Magnetic stray field vector of AOCS magneto-torquer coils (including magnetically induced effects of this) |
| dBThrust | Magnetic stray field vector of AOCS thruster activation |
| dBBattery | Magnetic stray field vector of batteries charge/discharge currents |
| dBSP | Magnetic stray field vector of solar panel currents |
| dBBus | Magnetic stray field vector of S/C bus currents |
| dBVFM | Magnetic stray field vector of VFM sensor |
Table 7: Measurement Data Set Record of ASMXAUX_1B Product
The VFMXAUX_1B Product contains detailed information on the S/C magnetic stray fields and the Sun induced stray field (implemented from Product Baseline 04) at the VFM sensor position. The data are provided at 50 Hz at the time-instants of the VFM measurements; the stray field vectors are provided in the VFM sensor frame. The measurement data set record of the VFMXAUX_1B Product is described in Table 8. See also VFMXAUX_1B Data Set Record, MDR_VFMAUX.
| t | Time, UTC |
| dBSun | Magnetic stray field vector of Sun induced stray field (implemented from Product Baseline 04) |
| dBAOCS | Magnetic stray field vector of AOCS magneto-torquer coils (including magnetically induced effects of this) |
| dBThrust | Magnetic stray field vector of AOCS thruster activation |
| dBBattery | Magnetic stray field vector of batteries charge/discharge currents |
| dBSP | Magnetic stray field vector of solar panel currents |
| dBBus | Magnetic stray field vector of S/C bus currents |
| dBSTR | Static magnetic stray field vector of STR Camera Head Units (CHUs) |
| dBStatic | Static magnetic stray field vector of rest of S/C |
| dBInd | Magnetically induced stray field vector, from S/C |
| dBState | Instrument and sub-system state dependent stray field vector, including latch valves |
Table 8: Measurement Data Set Record of VFMXAUX_1B Product
The EFIX_LP_1B Product contains plasma data from the Langimur Probe (LP) of the Electrical Field Instrument (EFI). The plasma product encompasses the plasma density and temperature. Data is provided at 2 Hz rate. The time instant are determined by the EFI instruments. No interpolation of the EFI data is performed, neither to shift the measurements in time nor to fill any gaps.
The measurement data set record of the plasma product is listed in Table 9 below. See also Plasma Data Set Record, MDR_EFI_LP
| t | Time, UTC |
| r | Position in ITRF, spherical geometric coordinates |
| Uorbit | Magnitude of S/C velocity in the ITRF |
| Ne | Plasma density |
| Ne,error | Error estimate of Ne |
| Te | Plasma electron temperature |
| Te,error | Error estimate of Telec |
| Vs | S/C potential |
| Vs,error | Error estimate of Vs |
| FlagsLP | Common flags of the LP data |
| FlagsNe | Flags of the plasma density, Ne |
| FlagsTe | Flags of the electron temperature, Te |
| FlagsVs | Flags of the S/C potential, Vs |
Table 9: Measurement Data Set Records of EFIX_PL_1B Product
The EFIXLPI_1B Product contains the EFIX_LP_1B plasma data interpolated at full UTC seconds, the same as the low resolution magnetic data MAG_LR.
The measurement data set record of the plasma product is listed in Table 10 below. See also Plasma Data Set Record, MDR_EFILPI
| t | Time, UTC |
| r | Position, ITRF, spherical geometric coordinates |
| Uorbit | Magnitude of S/C velocity in the ITRF |
| Ne | Plasma density |
| Ne,error | Error estimate of Ne |
| Te | Plasma electron temperature |
| Te,error | Error estimate of Telec |
| Vs | S/C potential |
| Vs,error | Error estimate of Vs |
| FlagsLP | Common flags of the LP data |
| FlagsNe | Flags of the plasma density, Ne |
| FlagsTe | Flags of the electron temperature, Te |
| FlagsVs | Flags of the S/C potential, Vs |
Table 10: Measurement Data Set Records of EFIX_PL_1B Product
The LP_X_CA_1B Product contains the TCF.LP Data Set records containing the LP calibration parameters determined in the Level 1b Processor from the Offset Determination Sweep Mode telemetry including the measurements themselves.
| T | Time of the LP Offset Determination Sweep |
| Probe1_I_Bias_Offset | Probe 1 current bias offset determined |
| Probe1_I_Slope_Offset | Probe 1 current slope offset determined |
| Probe1_I_Fit_Error | Error in fit of Probe 1 current sweep data |
| Probe1_U_Bias_Offset | Probe 1 voltage bias offset determined |
| Probe1_U_Slope_Offset | Probe 1 voltage slope offset |
| Probe1_U_Fit_Error | Error in fit of Probe 1 voltage sweep data |
| Probe2_I_Bias_Offset | Probe 2 current bias offset |
| Probe2_I_Slope_Offset | Probe 2 current slope offset |
| Probe2_I_Fit_Error | Error in fit of Probe 2 current sweep data |
| Probe2_U_Bias_Offset | Probe 2 voltage bias offset determined |
| Probe2_U_Slope_Offset | Probe 2 voltage slope offset |
| Probe2_U_Fit_Error | Error in fit of Probe 2 voltage sweep data |
| FP_I_Bias_Offset | Face Plate current bias offset |
| FP_I_Slope_Offset | Face Plate current slope offset |
| FP_I_Fit_Error | Error in fit of Face Plate current sweep data |
| FP_U_Bias_Offset | Face Plate voltage bias offset |
| FP_U_Slope_Offset | Face Plate voltage slope offset |
| FP_U_Fit_Error | Error in fit of Face Plate voltage sweep data |
| FP_I_offset | Vector of Face Plate current offset measurements |
| FP_U_offset | Vector of Face Plate bias offset measurements |
| P1_I_offset | Vector of Probe 1 current offset measurements |
| P1_U_offset | Vector of Probe 1 bias offset measurements |
| P1_ref_ADC2 | Vector of Probe 1 reference ADC2 |
| P1_ground | Vector of Probe 1 ground |
| P2_I_offset | Vector of Probe 2 current offset measurements |
| P2_U_offset | Vector of Probe 2 bias offset measurements |
| P2_ref_ADC2 | Vector of Probe 2 reference ADC2 |
| P2_ground | Vector of Probe 2 ground |
| P1_Slope | Probe 1 slope offset, determined on-board |
| P1_Bias | Probe 1 bias offset, determined on-board |
| P1_Error | Probe 1 fit error, determined on-board |
| P2_Slope | Probe 2 slope offset, determined on-board |
| P2_Bias | Probe 2 bias offset, determined on-board |
| P2_Error | Probe 2 fit error, determined on-board |
Table 10: TCF.LP Data Set Record
The Swarm "position" Products consists of
The GPSX_RO_1B and GPSX_RN_1B Products store GPSR data in the RINEX 3.00 format generally used for LEO satellites. The description of the format can be found in [RD-4] - rinex300.pdf. The contents of the two Products are:
The ephemeris information for Swarm is stored in three products:
See Position and Velocity Data Set Records, MDR_NAVSP3 and MDR_MODSP3 and Attitude Data Set Record, MDR_SAT_AT for detailed descriptions of the Products.
| T | Time, UTC |
| q | Rotation from ITRF to S/C frame (from STR) |
| Flagsq | Flags related to the S/C attitude information (q) |
| Maneuver_Id | Identification of actual S/C maneuver |
Table 12: S/C Attitude Measurement Data Set Record of STRXATT_1B Product
The ACCX_PR_1B Product contains pre-processed acceleration data. The data are not calibrated to the final level of accuracy as this is part of the Precise Orbit Determination (Level 2 processing).
The measurement data set record of the ACCX_PR_1B Product is given in Table 13 below. See also Acceleration Data Set Record, MDR_ACC_PR
| t | Time, UTC, ACC linear acceleration measurement time instants, time of angular acceleration measurement is approximately t - 0.12 s |
| a | Pre-processed linear acceleration data, S/C frame |
| aang | Pre-processed angular acceleration data, S/C frame |
| p | Position of proof mass within ACC cavity, ACC frame |
| pang | Angular position of proof mass within ACC cavity, ACC frame |
| Temp | Temperatures of the ACC |
| VpLTC1043 | Voltage of positive power source of LTC1043 (housekeeping info) |
| VnLTC1043 | Voltage of negative power source of LTC1043 (housekeeping info) |
| Upol | Polarization voltage |
| acentr* | Centrifugal acceleration, S/C frame |
| aGG* | Gravity gradient acceleration, S/C frame |
| FlagsACC | Flags related to the ACC |
| FlagsPlatform | Flags related to the S/C platform |
|
The elements marked with an asterix (*) are correctional terms which may or may not have been applied to (subtracted from) the data as indicated in FlagsACC. |
|
Table 13: Measurement Data Set Record of ACCX_PR_1B Product
The SC_XDYN_1B Product contains auxiliary data needed for precise orbit determination and non-gravitational force modelling.
The data set record of the SC_XDYN_1B Product is given in the table below.
| t | Time, UTC |
| aSun | Acceleration due to Solar radiation pressure, S/C frame |
| eSun | Direction to the Sun, unit vector, S/C frame |
| AXxx | Cross sections of the S/C, orbit frame, Xxx = head, down, left, right |
| KEarth | Downward optical reflectivity normal |
| mS/C | Mass of S/C |
| rCoG | Position of CoG, S/C frame |
| PGas | Pressure of gas tanks |
| TGas | Temperature of gas tanks |
| FlagsPlatform | Flags related to the S/C platform (indicates if all inputs were available or one or more was missing) |
| dtthr | Thruster on-time in seconds (Start of on-time at "Timestamp"), field with 12 colmns (column 1 = ACT 1,… , column 9 = OCT 1,…) |
| thrset | Flag indicating which thruster branch was active (= 0 for no thrusters powered, = 1 for main units powered, = 2 for redundant units powered, =3 for both main and redundant units powered) |
| fthr | Nominal thrust force of activated thrusters (combined force), field with 3 columns |
This section contains the describtion of the L1b data product file containing the Swarm orbit numbers. The new Swarm Orbit Counter data file is referred with a new dedicated product type (ORBxCNT), and it provides precise Swarm orbit number information to the scientific user community.
| Product identifier | AUXxORBCNT | ||||||||||||||||||||||||||||
| Definition | The Swarm orbit counter auxiliary data file provides precise Swarm orbit number information. The start of an orbit is defined as the Equator crossing of the ascending node (i.e. the northbound Equator crossing). For more information see product document. | ||||||||||||||||||||||||||||
| Units | - | ||||||||||||||||||||||||||||
| Quality indicator | Source of orbit number information Values: best quality is 0 and reduced quality is 1. | ||||||||||||||||||||||||||||
| Data format |
ASCII
|
||||||||||||||||||||||||||||
| Update rate | Daily | ||||||||||||||||||||||||||||
| Availability | Swarm Data Access | ||||||||||||||||||||||||||||
| Notes |
This section contains the detailed definitions of the Swarm Level 1b Product Data Sets.
Generally, data are stored in binary format as signed or unsigned integers with suitable (decimal) scalings to accommodate the required range and resolution of the stored quantities. This provides a simple and efficient though flexible method of storing the data.
Latitude and longitude – provided as parts of geographical position information – ranges are symmetric around zero, i.e. latitude[-90..+90] and longitude[-180..+180].
The following sections contain Data Set Definition tables with the following entries:
|
Column |
Description |
||||||||||||||||||
| FIELD | Field name | ||||||||||||||||||
| DESCRIPTION | Short description of the field | ||||||||||||||||||
| UNITS |
Physical units of the field value:
eu = engineering units m = meters deg = degrees as = arc seconds (1°/3600 ˜ 0.000278°) nT = nano-Tesla (10-9 T) C = degrees Celcius s = seconds UTC = Coordinated Universal Time <blank> = no unit
|
||||||||||||||||||
| DIM | Dimensions of the stored values | ||||||||||||||||||
| TYPE |
Type of stored integer value:
|
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of VFM), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
Latitude |
Position in ITRF – Geocentric latitude |
deg |
1 |
CDF_DOUBLE |
|
Longitude |
Position in ITRF – Geocentric longitude |
deg |
1 |
CDF_DOUBLE |
|
Radius |
Position in ITRF – Radius |
m |
1 |
CDF_DOUBLE |
|
B_VFM |
Magnetic field vector, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
B_NEC |
Magnetic field vector, NEC frame, zero if Flags_q = 255 |
nT |
3 |
CDF_DOUBLE |
|
dB_Sun |
Magnetic stray field correction vector of Sun induced stray field, VFM frame (implemented from Product Baseline 04) |
nT |
3 |
CDF_DOUBLE |
|
dB_AOCS |
Magnetic stray field correction vector of AOCS magneto-torquer coils, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_other |
Magnetic stray field correction vector of all other sources, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
B_error |
Error estimates on magnetic field, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
q_NEC_CRF |
Quaternion, transformation: NEC ? CRF |
|
4 |
CDF_DOUBLE |
|
Att_error |
Error estimates on attitude information |
mdeg |
1 |
CDF_DOUBLE |
|
Flags_B |
Flags characterizing the magnetic field measurement, see Table 14 |
|
1 |
CDF_UINT1 |
|
Flags_q |
Flags characterizing the attitude information, see Table 14 |
|
1 |
CDF_UINT1 |
|
Flags_Platform |
Flags characterizing the S/C platform information, see Table 14 |
|
1 |
CDF_UINT2 |
The values of the Flags_xxx fields of MDR_MAG_HR are given in the following table.
|
Flag |
Value |
Description |
|
Flags_B |
0 |
Magnetic field measurements (VFM) nominal |
|
1 |
ASM instrument turned off |
|
|
2 |
Outlier detected, gap, or not enough VFM temperature data for filtering |
|
|
3 |
Both conditions (values) 1 and 2 above |
|
|
4 |
Suspiciuos VFM sample |
|
|
5-7 |
Combination (sum) of values 1-4 |
|
|
8 |
Discrepancy between ASM and VFM measurements |
|
|
10,12,14 |
Combination (sum) of values 2, 4, and 8 |
|
|
Flags_q |
0 |
Attitude information (STR) nominal |
|
1 |
Lack of 1 or 2 attitudes of CHU1 in 4 nearest STR samples |
|
|
2 |
Lack of 1 or 2 attitudes of CHU2 in 4 nearest STR samples |
|
|
3 |
Lack of 1 or 2 attitudes of CHU3 in 4 nearest STR samples |
|
|
4 |
Lack of 3 or 4 attitudes of CHU1 in 4 nearest STR samples |
|
|
5 |
Lack of 3 or 4 attitudes of CHU2 in 4 nearest STR samples |
|
|
6 |
Lack of 3 or 4 attitudes of CHU3 in 4 nearest STR samples |
|
|
7 |
Not currently used |
|
|
8 |
On-ground aberrational correction of any attitude sample among 4 nearest STR samples. |
|
|
9-14 |
As 1-7 above with on-ground aberrational correction of any attitude sample among 4 nearest STR samples. |
|
|
15 |
Not currently used |
|
|
16 |
CHU1 obscured by bright object in 4 nearest STR samples (all 4 CHU1 samples invalid), CHU2 and CHU3 ok |
|
|
17 |
CHU2 obscured by bright object in 4 nearest STR samples (all 4 CHU2 samples invalid) , CHU1 and CHU3 ok |
|
|
18 |
CHU3 obscured by bright object in 4 nearest STR samples (all 4 CHU3 samples invalid) , CHU1 and CHU2 ok |
|
|
19 |
Lack of 2-4 attitudes of CHU1 and CHU2 in 4 nearest STR samples, but not both simultaneously |
|
|
20 |
Lack of 2-4 attitudes of CHU1 and CHU3 in 4 nearest STR samples, but not both simultaneously |
|
|
21 |
Lack of 2-4 attitudes of CHU2 and CHU3 in 4 nearest STR samples, but not both simultaneously |
|
|
22 |
Lack of 3-4 attitudes of CHU1, CHU2, and CHU3 in 4 nearest STR samples, but not two simultaneously |
|
|
23 |
Not currently used |
|
|
24-30 |
As 16-22 above with on-ground aberrational correction. |
|
|
31 |
Not currently used |
|
|
32 |
1 or 2 attitudes based on CHU1 alone (CHU2 and CHU3 missing) in 4 nearest STR samples |
|
|
33 |
1 or 2 attitudes based on CHU2 alone in 4 nearest STR samples |
|
|
34 |
1 or 2 attitudes based on CHU3 alone in 4 nearest STR samples |
|
|
35 |
2 attitudes based on single, intermittent CHU alone in 4 nearest STR samples |
|
|
36-39 |
Not currently used |
|
|
40-43 |
As 32-35 above with on-ground aberrational correction. |
|
|
44-47 |
Not currently used |
|
|
48 |
1 attitude sample missing among 4 nearest STR samples (data gap) |
|
|
49 |
2 attitude samples missing among 4 nearest STR samples |
|
|
50 |
3 or more attitude samples missing among 4 nearest STR samples |
|
|
51 |
3 or 4 attitudes based on CHU1 alone in 4 nearest STR samples |
|
|
52 |
3 or 4 attitudes based on CHU2 alone in 4 nearest STR samples |
|
|
53 |
3 or 4 attitudes based on CHU3 alone in 4 nearest STR samples |
|
|
54 |
3 or 4 attitudes based on single, intermittent CHU alone in 4 nearest STR samples |
|
|
55 |
Not currently used |
|
|
56-62 |
As 48-54 above with on-ground aberrational correction. |
|
|
63-254 |
Not currently used |
|
|
255 |
Not enough STR data for generating attitude information. |
|
|
Flags_Platform |
0 |
Platform telemetry nominal (no missing or suspicious data) |
|
1 |
Thruster latch valves open, thrusters not activated |
|
|
2 |
Thrusters activated |
|
|
4 |
Gap in Bus telemetry, 1 or 2 samples missing |
|
|
5-7 |
Used for combinations (sum) of values 1, 2, and 4 |
|
|
8 |
Outlier detected in Bus currents |
|
|
9-15 |
Used for combinations (sum) of values 1-8 |
|
|
16 |
Not enough data for filtering Bus currents (due to large gap or jump in data) |
|
|
17-31 |
Used for combinations (sum) of values 1-16 |
|
|
32 |
Change in instrument state according to Bus telemetry |
|
|
33-63 |
Used for combinations (sum) of values 1-32 |
|
|
64 |
No Bus telemetry available (for extended period) |
|
|
65-67 |
Used for combinations (sum) of values 1, 2 and 64 |
|
|
128 |
Gap in AOCS telemetry |
|
|
129-195 |
Used for combinations (sum) of values 1-67 and 128 |
|
|
256 |
Position information based on on-board (GPSR) navigational solution |
|
|
257-323 384-451 |
Used for combinations (sum) of values 1-67, 128, and 256 |
Table 14: Flag Values of MDR_MAG_HR
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of VFM), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
Latitude |
Position in ITRF – Geocentric latitude |
deg |
1 |
CDF_DOUBLE |
|
Longitude |
Position in ITRF – Geocentric longitude |
deg |
1 |
CDF_DOUBLE |
|
Radius |
Position in ITRF – Radius |
m |
1 |
CDF_DOUBLE |
|
F |
Magnetic field intensity, zero if Flags_F = 255 |
nT |
1 |
CDF_DOUBLE |
|
dF_AOCS |
Magnetic stray field correction intensity of AOCS magneto-torquer coils |
nT |
1 |
CDF_DOUBLE |
|
dF_other |
Magnetic stray field correction intensity of all other sources |
nT |
1 |
CDF_DOUBLE |
|
F_error |
Error estimate on magnetic field intensity |
nT |
1 |
CDF_DOUBLE |
|
B_VFM |
Magnetic field vector, VFM frame, zero if Flags_B = 255 |
nT |
3 |
CDF_DOUBLE |
|
B_NEC |
Magnetic field vector, NEC frame, zero if Flags_B = 255 or Flags_q = 255 |
nT |
3 |
CDF_DOUBLE |
|
dB_Sun |
Magnetic stray field vector of Sun induced stray field, VFM frame (implemented from Product Baseline 04) |
nT |
3 |
CDF_DOUBLE |
|
dB_AOCS |
Magnetic stray field correction vector of AOCS magneto-torquer coils, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_other |
Magnetic stray field correction vector of all other sources, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
B_error |
Error estimates on magnetic field, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
q_NEC_CRF |
Quaternion, transformation: NEC ? CRF |
|
4 |
CDF_DOUBLE |
|
Att_error |
Error estimates on attitude information |
mdeg |
1 |
CDF_DOUBLE |
|
Flags_F |
Flags characterizing the magnetic field intensity measurement (F), see Table 15 |
|
1 |
CDF_UINT1 |
|
Flags_B |
Flags characterizing the magnetic field vector measurement (B_VFM, B_NEC), see Table 15 |
|
1 |
CDF_UINT1 |
|
Flags_q |
Flags characterizing the attitude information, see Table 14 |
|
1 |
CDF_UINT1 |
|
Flags_Platform |
Flags characterizing the S/C platform information, see Table 14 |
|
1 |
CDF_UINT2 |
|
ASM_Freq_Dev |
ASM frequency calibration data deviation |
|
1 |
CDF_DOUBLE |
The values of the Flags_q and Flags_Platform fields of MDR_MAG_LR are as for the MDR_MAG_HR given in Table 14; the values of Flags_F and Flags_B are given in the following table.
|
Flag |
Value |
Description |
|
Flags_F |
0 |
Magnetic field intensity measurements (ASM) nominal (scalar mode) |
|
1 |
ASM running in vector mode |
|
|
2 |
Outlier detected, gap, or not enough ASM frequency calibration data for filtering |
|
|
3 |
Combination (sum) of values 1 and 2 |
|
|
4 |
At least one of 4 nearest ASM samples is suspicious |
|
|
5-7 |
Combination (sum) of values 1-4 |
|
|
8 |
Within 8 seconds after ASM restart, loss of magnetic field lock, or telemetry gap |
|
|
9-15 |
Combination (sum) of values 1-8 |
|
|
16 |
Discrepancy between ASM and VFM measurements – at least one of the 4 nearest ASM samples differ from VFM measurements |
|
|
17-31 |
Combination (sum) of values 1-16 |
|
|
32 |
Gap in 4 nearest ASM samples |
|
|
33-63 |
Combination (sum) of values 1-32 |
|
|
64 |
VFM instrument turned off, i.e. no stray field corrections |
|
|
65-79 96-111 |
Combination (sum) of value 64 with values 1-15 and 32-47 |
|
|
255 |
Not enough ASM samples to generate F. |
|
|
Flags_B |
0 |
Magnetic field vector measurements (VFM) nominal |
|
1 |
ASM instrument turned off |
|
|
2 |
Outlier detected, gap, or not enough VFM temperature data for filtering |
|
|
3 |
Both conditions (values) 1 and 2 above |
|
|
4 |
More than 5 suspiciuos VFM samples in 2 seconds surrounding record time |
|
|
5-7 |
Combination (sum) of values 1-4 |
|
|
8 |
Discrepancy between ASM and VFM measurements |
|
|
10,12,14 |
Combination (sum) of values 2, 4, 8 |
|
|
16 |
Gap in VFM samples in surrounding 2 seconds (by rejection or missing data) |
|
|
17-24 26,28,30 |
Combination (sum) of values 1, 2, 4, 8, and 16 (but not 1 and 8 simultaneously) |
|
|
255 |
Not enough VFM samples to generate B_VFM and B_NEC |
Table 15: Flags_F and Flags_B Values of MDR_MAG_LR
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of VFM), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
Latitude |
Position in ITRF – Geocentric latitude |
deg |
1 |
CDF_DOUBLE |
|
Longitude |
Position in ITRF – Geocentric longitude |
deg |
1 |
CDF_DOUBLE |
|
Radius |
Position in ITRF – Radius |
m |
1 |
CDF_DOUBLE |
|
F |
Magnetic field intensity, converted and corrected – not adjusted for filter group delay |
nT |
1 |
CDF_DOUBLE |
|
dF_AOCS |
Magnetic stray field correction intensity of AOCS magneto-torquer coils |
nT |
1 |
CDF_DOUBLE |
|
dF_other |
Magnetic stray field correction intensity of all other sources |
nT |
1 |
CDF_DOUBLE |
|
F_error |
Error estimate on magnetic field intensity |
nT |
1 |
CDF_DOUBLE |
|
F_VFM |
Magnetic field intensity from the VFM instrument, converted and corrected |
nT |
1 |
CDF_DOUBLE |
|
B |
Magnetic field vector, VFM frame, time tshifted+dt |
nT |
3 |
CDF_DOUBLE |
|
dB_Sun |
Magnetic stray field correction vector of Sun induced stray field, VFM frame, time tshifted+dt_VFM (implemented from Product Baseline 04) |
nT |
3 |
CDF_DOUBLE |
|
dB_AOCS |
Magnetic stray field correction vector of AOCS magneto-torquer coils, VFM frame, time tshifted+dt_VFM |
nT |
3 |
CDF_DOUBLE |
|
dB_other |
Magnetic stray field correction vector of all other sources, VFM frame, time tshifted+dt_VFM |
nT |
3 |
CDF_DOUBLE |
|
B_pre |
Pre-calibrated VFM magnetic field vector, VFM frame, time tshifted+dt_VFM (implemented from Product Baseline 04) |
nT |
3 |
CDF_DOUBLE |
|
EU_VFM |
Raw VFM measuremet, time tshifted+dt_VFM |
eu |
3 |
CDF_DOUBLE |
|
T_CDC |
Temperature of VFM CDC, time tshifted+dt_VFM |
°C |
1 |
CDF_DOUBLE |
|
T_CSC |
Temperature of VFM CSC, time tshifted+dt_VFM |
°C |
1 |
CDF_DOUBLE |
|
T_EU |
Temperature of VFM EU, time tshifted+dt_VFM |
°C |
1 |
CDF_DOUBLE |
|
dt_VFM |
Time offset of VFM measurement |
s |
1 |
CDF_DOUBLE |
|
alpha |
Solar inclination angle, rotation about -y axis, S/C frame, time tshifted+dt_VFM (implemented from Product Baseline 04) |
deg |
1 |
CDF_DOUBLE |
|
beta |
Solar inclination angle, angleto -y axis, S/C frame, time tshifted+dt_VFM (implemented from Product Baseline 04) |
deg |
1 |
CDF_DOUBLE |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
Timestamp_end |
Time of last observation |
UTC |
1 |
CDF_EPOCH |
|
Primary_EU |
Id of active VFM DPU, 1 = primary, 3 = secondary |
|
1 |
CDF_INT4 |
|
Bias |
Vector of estimated offsets |
nT |
3 |
CDF_DOUBLE |
|
Scale |
Vector of estimated sensitivities |
|
3 |
CDF_DOUBLE |
|
Non_orth |
Vector of estimated non-orthogonalities |
mdeg |
3 |
CDF_DOUBLE |
|
Samples |
Number of samples used in estimation |
|
1 |
CDF_UNIT4 |
|
Rms |
Weighted rms value of residuals after estimation |
nT |
1 |
CDF_DOUBLE |
|
Cov_row1 |
Covariances of estimated parameters – lower left part of covariance matrix - row 1 |
|
1 |
CDF_DOUBLE |
|
Cov_row2 |
Covariances of estimated parameters – lower left part of covariance matrix - row 2 |
|
2 |
CDF_DOUBLE |
|
Cov_row3 |
Covariances of estimated parameters – lower left part of covariance matrix - row 3 |
|
3 |
CDF_DOUBLE |
|
Cov_row4 |
Covariances of estimated parameters – lower left part of covariance matrix - row 4 |
|
4 |
CDF_DOUBLE |
|
Cov_row5 |
Covariances of estimated parameters – lower left part of covariance matrix - row 5 |
|
5 |
CDF_DOUBLE |
|
Cov_row6 |
Covariances of estimated parameters – lower left part of covariance matrix - row 6 |
|
6 |
CDF_DOUBLE |
|
Cov_row7 |
Covariances of estimated parameters – lower left part of covariance matrix - row 7 |
|
7 |
CDF_DOUBLE |
|
Cov_row8 |
Covariances of estimated parameters – lower left part of covariance matrix - row 8 |
|
8 |
CDF_DOUBLE |
|
Cov_row9 |
Covariances of estimated parameters – lower left part of covariance matrix - row 9 |
|
9 |
CDF_DOUBLE |
|
W_scale |
Log (base 10) values of actual scaling of weigths of a-priori information |
|
9 |
CDF_DOUBLE |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of VFM), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
dB_AOCS |
Magnetic stray field vector of AOCS magneto-torquer coils, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Thrust |
Magnetic stray field vector of AOCS thruster activations, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Battery |
Magnetic stray field vector of battery currents, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_SP |
Magnetic stray field vector of solar panels currents, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Bus |
Magnetic stray field vector of S/C bus currents, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_VFM |
Magnetic stray field vector of VFM sensor, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Static |
Static magnetic stray field vector of S/C platform, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Ind |
Magnetically induced stray field vector of S/C platform, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_State |
Instrument and sub-system state dependent magnetic stray field vector, ASM frame |
nT |
3 |
CDF_DOUBLE |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of VFM), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
dB_Sun |
Magnetic field correction vector of Sun induced stray magnetic field, VFM frame (implemented from Product Baseline 04) |
nT |
3 |
CDF_DOUBLE |
|
dB_AOCS |
Magnetic stray field vector of AOCS magneto-torquer coils, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Thrust |
Magnetic stray field vector of AOCS thruster activations, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Battery |
Magnetic stray field vector of battery currents, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_SP |
Magnetic stray field vector of solar panels currents, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Bus |
Magnetic stray field vector of S/C bus currents, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_STR |
Magnetic stray field vector of STR CHUs, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Static |
Static magnetic stray field vector of S/C platform, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_Ind |
Magnetically induced stray field vector of S/C platform, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
dB_State |
Instrument and sub-system state dependent magnetic stray field vector, VFM frame |
nT |
3 |
CDF_DOUBLE |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
delta_t |
Time difference between first observation in the two ASM_VFM_IC records |
s |
1 |
CDF_DOUBLE |
|
delta_bias |
Differences in estimated offsets |
nT |
3 |
CDF_DOUBLE |
|
delta_scale |
Differences in estimated scale values |
|
3 |
CDF_DOUBLE |
|
delta_non orth |
Differences in estimated non-orthogonality angles |
mdeg |
3 |
CDF_DOUBLE |
|
Threshold1_bias |
Threshold 1 value, bias |
nT |
1 |
CDF_DOUBLE |
|
Threshold1_scale |
Threshold 1 value, scale |
|
1 |
CDF_DOUBLE |
|
Threshold1_non-orth |
Threshold 1 value, non-orthogonality |
mdeg |
1 |
CDF_DOUBLE |
|
Threshold2_bias |
Threshold 2 value, bias |
nT |
1 |
CDF_DOUBLE |
|
Threshold2_scale |
Threshold 2 value, scale |
|
1 |
CDF_DOUBLE |
|
Threshold2_non-orth |
Threshold 2 value, non-orthogonality |
mdeg |
1 |
CDF_DOUBLE |
|
Messages |
Number of messages, the Message_ID field below is repeated Messages times |
|
1 |
CDF_INT4 |
|
Message_ID |
Message id, see Table 16 below |
|
1 |
CDF_INT4 |
The values of Message_ID are given in the following table.
|
Value |
Description |
|
1 |
All changes within threshold1. CCDB remains unchanged. |
|
10 |
All changes within threshold2, at least one change above threshold1. CCDB parameters to be updated with linear change in time. |
|
100 |
At least on change above threshold2. Furhter investigations needed. CCDB remains unchanged until further notice. |
|
TBD |
Additional messages, warnings, and errors |
Table 16: VFM_MAN_RP Message_ID Values
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Timestamp of the LP measurement |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of LP), source and quality, see Appendix D of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT2 |
|
Latitude |
Position in ITRF – Geocentric latitude |
deg |
1 |
CDF_DOUBLE |
|
Longitude |
Position in ITRF – Geocentric longitude |
deg |
1 |
CDF_DOUBLE |
|
Radius |
Position in ITRF – Radius |
m |
1 |
CDF_DOUBLE |
|
U_orbit |
Magnitude of spacecraft velocity in the ITRF | m/s | 1 | CDF_DOUBLE |
|
Ne |
Plasma density (electron) |
cm-3 |
1 |
CDF_DOUBLE |
|
Ne_error |
Error of the plasma density estimate |
cm-3 |
1 |
CDF_DOUBLE |
|
Te |
Plasma electron temperature |
K |
1 |
CDF_DOUBLE |
|
Te_error |
Error of the electron temperature estimate |
K |
1 |
CDF_DOUBLE |
|
Vs |
Spacecraft potential |
V |
1 |
CDF_DOUBLE |
|
Vs_error |
Error of the spacecraft potential estimate |
V |
1 |
CDF_DOUBLE |
|
Flags_LP |
Flags indicating the source of measurements, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Ne |
Flags characterizing the plasma density measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Te |
Flags characterizing the electron temperature measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Vs |
Flags characterizing the spacecraft potential measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Exact UTC second of the interpolated LP measurement |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of LP), source and quality, see Appendix D of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT2 |
|
Latitude |
Position in ITRF – Geocentric latitude |
deg |
1 |
CDF_DOUBLE |
|
Longitude |
Position in ITRF – Geocentric longitude |
deg |
1 |
CDF_DOUBLE |
|
Radius |
Position in ITRF – Radius |
m |
1 |
CDF_DOUBLE |
|
U_orbit |
Magnitude of spacecraft velocity in the ITRF | m/s | 1 | CDF_DOUBLE |
|
Ne |
Plasma density (electron) |
cm-3 |
1 |
CDF_DOUBLE |
|
Ne_error |
Error of the plasma density estimate |
cm-3 |
1 |
CDF_DOUBLE |
|
Te |
Plasma electron temperature |
K |
1 |
CDF_DOUBLE |
|
Te_error |
Error of the electron temperature estimate |
K |
1 |
CDF_DOUBLE |
|
Vs |
Spacecraft potential |
V |
1 |
CDF_DOUBLE |
|
Vs_error |
Error of the spacecraft potential estimate |
V |
1 |
CDF_DOUBLE |
|
Flags_LP |
Flags indicating the source of measurements, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Ne |
Flags characterizing the plasma density measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Te |
Flags characterizing the electron temperature measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
Flags_Vs |
Flags characterizing the spacecraft potential measurement, see Table 6-4 of SW-RS-DSC-SY-0007 |
|
1 |
CDF_UINT1 |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status, source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
Probe1_I_Bias_Offset |
Probe 1 current bias offset |
V |
1 |
CDF_DOUBLE |
|
Probe1_I_Slope_Offset |
Probe 1 current slope offset |
V |
1 |
CDF_DOUBLE |
|
Probe1_I_Fit_Error |
Probe 1 current sweep fit error |
V |
1 |
CDF_DOUBLE |
|
Probe1_U_Bias_Offset |
Probe 1 voltage bias offset |
V |
1 |
CDF_DOUBLE |
|
Probe1_U_Slope_Offset |
Probe 1 voltage slope offset |
V |
1 |
CDF_DOUBLE |
|
Probe1_U_Fit_Error |
Probe 1 voltage sweep fit error |
V |
1 |
CDF_DOUBLE |
|
Probe2_I_Bias_Offset |
Probe 2 current bias offset |
V |
1 |
CDF_DOUBLE |
|
Probe2_I_Slope_Offset'''' |
Probe 2 current slope offset |
V |
1 |
CDF_DOUBLE |
|
Probe2_I_Fit_Error'''' |
Probe 2 current sweep fit error |
V |
1 |
CDF_DOUBLE |
|
Probe2_U_Bias_Offset |
Probe 2 voltage bias offset |
V |
1 |
CDF_DOUBLE |
|
Probe2_U_Slope_Offset |
Probe 2 voltage slope offset |
V |
1 |
CDF_DOUBLE |
|
Probe2_U_Fit_Error |
Probe 2 voltage sweep fit error |
V |
1 |
CDF_DOUBLE |
|
FP_I_Bias_Offset |
Face Plate current bias offset |
V |
1 |
CDF_DOUBLE |
|
FP_I_Slope_Offset'''' |
Face Plate current slope offset |
V |
1 |
CDF_DOUBLE |
|
FP_I_Fit_Error'''' |
Face Plate current sweep fit error |
V |
1 |
CDF_DOUBLE |
|
FP_U_Bias_Offset |
Face Plate voltage bias offset |
V |
1 |
CDF_DOUBLE |
|
FP_U_Slope_Offset |
Face Plate voltage slope offset |
V |
1 |
CDF_DOUBLE |
|
FP_U_Fit_Error |
Face Plate voltage sweep fit error |
V |
1 |
CDF_DOUBLE |
|
FP_I_offset |
Face Plate current offset measurements |
eu |
32 |
CDF_INT2 |
|
FP_U_offset |
Face Plate bias offset measurements |
eu |
32 |
CDF_INT2 |
|
P1_I_offset |
Probe 1 current offset measurements |
eu |
32 |
CDF_INT2 |
|
P1_U_offset |
Probe 1 bias offset measurements |
eu |
32 |
CDF_INT2 |
|
P1_ref_ADC2 |
Probe 1 reference ADC2 |
eu |
32 |
CDF_INT2 |
|
P1_ground |
Probe 1 ground |
eu |
32 |
CDF_INT2 |
|
P2_I_offset |
Probe 2 current offset measurements |
eu |
32 |
CDF_INT2 |
|
P2_U_offset |
Probe 2 bias offset measurements |
eu |
32 |
CDF_INT2 |
|
P2_ref_ADC2 |
Probe 2 reference ADC2 |
eu |
32 |
CDF_INT2 |
|
P2_ground |
Probe 2 ground |
eu |
32 |
CDF_INT2 |
|
P1_Slope |
Probe 1 slope offset, determined on-board |
V |
1 |
CDF_DOUBLE |
|
P1_Bias |
Probe 1 bias offset, determined on-board |
V |
1 |
CDF_DOUBLE |
|
P1_Error |
Probe 1 sweep fit error, determined on-board |
V |
1 |
CDF_DOUBLE |
|
P2_Slope |
Probe 2 slope offset, determined on-board |
V |
1 |
CDF_DOUBLE |
|
P2_Bias |
Probe 2 bias offset, determined on-board |
V |
1 |
CDF_DOUBLE |
|
P2_Error |
Probe 2 sweep fit error, determined on-board |
V |
1 |
CDF_DOUBLE |
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
x0 |
Estimate of the x position of the image center. Sensor order: H, V (applies to all below) |
|
2 |
CDF_DOUBLE |
|
y0 |
Estimate of the y position of the image center. |
|
2 |
CDF_DOUBLE |
|
phi0 |
Estimate of mean azimuthal position of data points. |
deg |
2 |
CDF_DOUBLE |
|
r0 |
Radius of best-fit circle |
|
2 |
CDF_DOUBLE |
|
rms'''' |
Goodness of fit (rms error) |
|
2 |
CDF_DOUBLE |
|
Samples'''' |
Number of data points used in fit |
|
2 |
CDF_UINT4 |
|
Success |
Flag indicating whether fit succeeded or not, 1 = success |
|
2 |
CDF_UINT2 |
|
r1 |
Average of r1 |
|
2 |
CDF_DOUBLE |
|
r1_r1 |
Average of r1*r1 |
|
2 |
CDF_DOUBLE |
|
r1_y2 |
Average of r1*y2 |
|
2 |
CDF_DOUBLE |
|
U_SC |
Average of U_SC {spacecraft potential} |
V |
2 |
CDF_DOUBLE |
|
dVgf |
Average of (Vg – Vf) {deflection minus faceplate voltage} |
V |
2 |
CDF_DOUBLE |
|
Qram |
Average of (v_SC – vcr)2 {ram-directed plasma flow velocity, squared} |
m2/s2 |
2 |
CDF_UINT4 |
|
r1_samples |
Number of samples used in averages |
|
2 |
CDF_UINT4 |
These Data Set records forms ASCII files following the Extended Standard Product 3 Orbit Format (SP3-c), cf [RD-5]. These files may be compressed thereby reducing their size significantly. The "Number of Records" in the table in Product File refers to the number of observations in one SP3 file.
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status (of STR), source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
q |
Quaternion, transformation: ITRF ? S/C |
|
4 |
CDF_DOUBLE |
|
Flags_q |
Flags characterizing the attitude information, see Table 14 |
|
1 |
CDF_UINT1 |
|
Maneuver_Id |
Current maneuver identification code |
|
1 |
CDF_UINT1 |
These Data Set records forms the RINEX observations files according to [RD-4]. The format is thouroughly described in this document, rinex300.pdf, in particular Section 2 and Appendix A.
These Data Set records deviate from the RINEX GPS navigation files defined in [RD-4]. The format is thouroughly described in this document, rinex300.pdf, in particular Section 2 and Appendix A.
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
SyncStatus |
Time synchronization status, source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
a |
Non-gravitational, linear acceleration, partly converted, S/C frame |
m/s2 |
3 |
CDF_DOUBLE |
|
a_ang |
Angular acceleration, partly converted, S/C frame |
rad/s2 |
3 |
CDF_DOUBLE |
|
p |
Position of proof mass within cavity, ACC frame |
m |
3 |
CDF_DOUBLE |
|
p_ang |
Angular position of proof mass within cavity, ACC frame |
rad |
3 |
CDF_DOUBLE |
|
Temp |
Temperatures of ACC |
°C |
6 |
CDF_DOUBLE |
|
VpLTC1043 |
Positive voltage of LTC1043 |
V |
1 |
CDF_DOUBLE |
|
VnLTC1043 |
Negative voltage of LTC1043 |
V |
1 |
CDF_DOUBLE |
|
U_pol |
Polarization voltage |
V |
1 |
CDF_DOUBLE |
|
a_centr |
Centrifugal acceleration, S/C frame |
m/s2 |
3 |
CDF_DOUBLE |
|
a_GG |
Gravity gradient acceleration, S/C frame |
m/s2 |
3 |
CDF_DOUBLE |
|
Flags_ACC |
Flags characterizing the ACC, see Table 18 |
|
1 |
CDF_UINT2 |
|
Flags_Platform |
Flags characterizing the S/C platform information, see Table 18 |
|
1 |
CDF_UINT2 |
|
Maneuver_Id |
Current maneuver identification code |
|
1 |
CDF_UINT1 |
[1] "Observation" refers to the linear acceleration measurement; the angular acceleration measurement is approximately 0.12 s before.
|
Flag |
Value |
Description |
|
Flags_ACC |
0 |
Accelerometer measurements nominal (no corrections applied) |
|
1 |
a_Sun correction applied |
|
|
4 |
a_GG correction applied |
|
|
8 |
a_centr correction applied |
|
|
16 |
UPol detected as outlier |
|
|
32 |
Not used |
|
|
64 |
Temperature detected as outlier |
|
|
128 |
Proof mass angular position (pang) detected as outlier |
|
|
256 |
Proof mass linear position (p) detected as outlier |
|
|
512 |
Angular acceleration (aang) detected as outlier |
|
|
1024 |
Linear acceleration (a) detected as outlier |
|
|
5…2047 |
All combinations of the values above |
|
|
Flags_Platform |
0 |
Platform telemetry nominal |
|
4 |
Heater switching |
|
|
5,6 |
Combination (sum) of values 1 and 2 with 4 |
|
|
8 |
Level 1a.Bus.State telemetry missing |
|
|
9,10 |
Combination (sum) of values 1 and 2 with 8 |
|
|
16 |
Thruster firing |
|
|
17…26 |
Combination (sum) of values 1/2, 4/8 and 16 |
|
|
32 |
Level 1a.AOCS.Thru_HK telemetry missing |
|
|
33…42 |
Combination (sum) of values 1/2, 4/8 and 32 |
Table 18: Acceleration Product Flags
|
FIELD |
DESCRIPTION |
UNITS |
DIM |
TYPE |
|
|
Timestamp |
Time of observation |
UTC |
1 |
CDF_EPOCH |
|
|
SyncStatus |
Time synchronization status, source and quality, see Appendix D of [AD-13] |
|
1 |
CDF_UINT2 |
|
|
a_Sun |
|
m/s2 |
3 |
CDF_DOUBLE |
|
|
Direction to the Sun, unit vector, S/C frame |
|
3 |
CDF_DOUBLE |
|
|
m_SC |
Actual mass of S/C |
kg |
1 |
CDF_DOUBLE |
|
|
r_CoG |
Center of Gravity, S/C frame |
m |
3 |
CDF_DOUBLE |
|
|
A_head |
Cross section area normal, front |
m2 |
3 |
CDF_DOUBLE |
|
|
A_right |
Cross section area normal, right (+Y) |
m2 |
3 |
CDF_DOUBLE |
|
|
A_left |
Cross section area normal, left (-Y) |
m2 |
3 |
CDF_DOUBLE |
|
|
A_down |
Cross section area normal, down |
m2 |
3 |
CDF_DOUBLE |
|
|
Downward optical reflectivity normal |
m2 |
3 |
CDF_DOUBLE |
|
|
P_Gas |
Pressure of gas tanks |
Pa |
2 |
CDF_DOUBLE |
|
|
T_Gas |
Temperature of gas tanks |
°C |
2 |
CDF_DOUBLE |
|
|
Flags_Platform |
Flags characterizing the S/C platform information, see Table 18 |
|
1 |
CDF_UINT2 |
|
|
dt_thr |
Thruster on-time in seconds (Start of on-time at "Timestamp"), field with 12 colmns (column 1 = ACT 1, … , column 9 = OCT1, …) |
s |
1 |
CDF_DOUBLE |
|
| thr_set | Flag indicating which thruster branch was active (= 0 for no thrusters powered, = 1 for main units powered, = 2 for redundant units powered, =3 for both main and redundant units powered) | 1 |
CDF_UINT2 |
||
| f_thr | Nominal thrust force of activated thrusters* (combined force), field with 3 columns | mN | 3 | CDF_DOUBLE |