GOMOS Daily Report 08-APR-2012


Level 0 and Level 1 products

SUMMARY

1. General Info

 
2. Summary of products arrived in PCF (Product Control Facility)
2.1 Level 0: products arrived in PCF during current month (see template here)
2.2 Level 0: plot of mission plan versus production during reporting period
2.3 Level 0: summary of missing occultations with respect to the plan
2.4 Level 1: products arrived in PCF during reporting period

 
3. Plot of Spectrometers and Photometers temperatures

 
4. Dark Charge monitoring
4.1 Products that did not use the Dark Sky Area observation for DC computation
4.2 Plot of Dark Charge

 
5. Demodulation correction and quality product information monitoring
5.1 Percentage of products with some flags set
5.2 Plot of quality information per product (time dependant)
5.3 Plot of quality information per product (world map)

 
6. Star tangent altitude lost
6.1 Statistics on star tangent altitude lost
6.2 Plot of star tangent altitude lost: DARK products
6.3 Plot of star tangent altitude lost: BRIGHT products
6.3 Plot of star tangent altitude lost: TWILIGHT products

 
7. Star Acquisition and Tracking Unit (SATU)
7.1 SATU plots (dark limb): 'X' and 'Y' axis
7.2 SATU Noise Equivalent Angle statistics
7.2.1 SATU NEA Statistics (table)
7.2.2 Daily SATU NEA STD (dark limb) - trend since 1st April 2006

 
8.Auxiliary Data Files used for the production reported in section 2.4

 


Level 2 products




 

1. General Info

This report presents the daily analysis on parameters extracted from GOMOS level 1b data (GOM_TRA_1P).
It is intended to monitor some important parameters that will impact the quality of the level 2 products
as the Spectrometers and Photometers CCD Temperatures and Dark Charge, SATU noise equivalent angle...
A list of level 0 products (and content) that have arrived during the actual month to the PCF is also given.
 
Item Value
Time of report generation
10APR2012 07:00:32
Data source version
GOMOS/6.01
Start time of products
08APR2012 00:45:04
Stop time of products
08APR2012 07:26:02
Store outputs in DB
Yes
Nb of level 1b prods
5
Nb of prods with errors
0

2. Summary of products arrived in PCF (Product Control Facility)

2.1 Level 0 products arrived in PCF (see template here)

2.2 Plot of mission plan versus Level 0 production arrived in PCF during reporting period

Red segments are missing products.
Blue segments are available products.
Green segments are calibration measurements (not available products to users).

qds_image

2.3 Summary of missing occultations (red segments in previous plot)

UTC start time Star name Star ID Orbit
08-APR-2012 00:44:21
IotCen
0
52861
08-APR-2012 02:24:35
IotCen
0
52862
08-APR-2012 04:04:49
IotCen
0
52863
08-APR-2012 05:45:04
IotCen
0
52864
08-APR-2012 07:25:19
IotCen
0
52865
08-APR-2012 07:25:55
IotCen
123
52865

2.4 Summary of processed GOM_TRA_1P products

!Warning: No products without errors in DARK limb contitions found !Warning: No products without errors in BRIGHT limb contitions found
Nr Filename UTC Start time Limb Duration Star Id Star Name Star Mag Star Temp Nb Meas Orbit Prod. error
1
GOM_TRA_1PNPDE20120408_004504_000000413113_00261_52861_7765.N1
08-APR-2012 00:45:04
Straylight
41.000
123
Iot Cen
2.7500
10200.
82
52861
No
2
GOM_TRA_1PNPDE20120408_022518_000000423113_00262_52862_7807.N1
08-APR-2012 02:25:18
Straylight
42.000
123
Iot Cen
2.7500
10200.
84
52862
No
3
GOM_TRA_1PNPDE20120408_040532_000000443113_00263_52863_7867.N1
08-APR-2012 04:05:32
Straylight
43.500
123
Iot Cen
2.7500
10200.
87
52863
No
4
GOM_TRA_1PNPDE20120408_054547_000000393113_00264_52864_7929.N1
08-APR-2012 05:45:47
Straylight
39.000
123
Iot Cen
2.7500
10200.
78
52864
No
5
GOM_TRA_1PNPDK20120408_072602_000000413113_00265_52865_5143.N1
08-APR-2012 07:26:02
Straylight
41.000
123
Iot Cen
2.7500
10200.
82
52865
No

 

3. Plot of GOMOS spectrometers and photometers temperatures from level 1b data

qds_image


 

4. Overview of dark signal processing per product

The Dark Charge (DC) is a temperature-dependant signal added to the useful measurements and it is therefore substracted
from them during the processing. There are two phenomena that produce a continuous increase of the DC: the "hot pixels"
(a pixel is "hot" when its DC exceeds by a significant amount its value measured on ground at the same temperature) and
the "Random Telegraphic Signal" (abrupt change positive or negative of the CCD pixel signal, random in time, affecting
only the DC part of the signal and not the photon generated signal).
In this section a list of products that did not use the Dark Sky Area (DSA) observation for the DC computation is given.
It is also provided the mean DC plot per product for dark limb products with no error flag set.

4.1 These products did not use the DSA observation for DC computation:

Product name DC information
GOM_TRA_1PNPDE20120408_004504_000000413113_00261_52861_7765.N1
DC map used
GOM_TRA_1PNPDE20120408_022518_000000423113_00262_52862_7807.N1
DC map used
GOM_TRA_1PNPDE20120408_040532_000000443113_00263_52863_7867.N1
DC map used
GOM_TRA_1PNPDE20120408_054547_000000393113_00264_52864_7929.N1
DC map used
GOM_TRA_1PNPDK20120408_072602_000000413113_00265_52865_5143.N1
DC map used

4.2 Plot of mean dark charges per product: only products in DARK limb conditions without errors are used

No products without errors in DARK limb contitions found. No plot performed.
 

5. Demodulation flag and quality information monitoring

In this section it is presented the modulation information extracted from the pcd (product confidence data)
at measurement level and information extracted from the Quality Summary dataset. Only products without errors
(error flag in the MPH set to "0") are used.

 

5.1 Percentage of products during reporting period with:

At least one measurement with demodulation flag set:
80.0000 %
Reference spectrum computed from DB:
0.00000 %
Reference spectrum with small number of measurements:
0.00000 %
SATU data not used:
0.00000 %

 

5.2 Plot quality information per product (time dependant)

qds_image


 

5.3 Plot quality information per product (world map)

qds_image


 

6. Statistics and plot of tangent altitude of the last measurement (DARK & BRIGHT products without errors)

6.1 Statistics on tangent altitude lost:

Statistics DARK BRIGHT TWILIGHT
Mean:
NaN
NaN
NaN
St. deviation:
NaN
NaN
NaN
Maximum:
NaN
NaN
NaN
Minimum:
NaN
NaN
NaN
Number of data:
NaN
NaN
NaN

 

7. Star Acquisition and Tracking Unit (SATU)

The Star Acquisition and Tracking Unit (SATU) analyses the position of the tracked star beam collected by
the GOMOS telescope and deflected by the optical beam dispatcher. The main functin of the SATU is to detect
a star, provide its image position to the science data electronics and to help the pointing function to keep
the star image at a fixed position. In tracking mode the SATU data is recorded with a frecuency of 100 Hz.

 

7.1 SATU 'X' and 'Y' axis plots (dark limb)

SATU CCD 'X' and 'Y' axis plots are provided in order to detect any abnormal behaviour of the tracking system.
For every occultation (color) the plot should remain stable (with some noise) until we are deep in the atmosphere
where big fluctuations are registered due to the refractive effects.

 

7.2 Statistics on SATU Noise Equivalent Angle (NEA) for DARK (D) and BRIGHT (B) products above 105 kms

The Star Acquisition and Tracking Unit (it is the CCD that tracks the star while it is occulted) Noise Equivalent
Angle consists of the statistical angular variation of the SATU data above the atmosphere.
Statistics (in microradians) above 105 km are computed for every occultation, giving four values per occultation: one in the 'X'
direction and one in the 'Y' direction for dark and bright limbs. A mean value per day in every direction and limb
is calculated and monitored in order to assess instrument performance in terms of star pointing.

 

7.2.1 SATU NEA Statistics (table)

Statistics SATU X (D) SATU Y (D) SATU X (B) SATU Y (B)
Mean:
NaN
NaN
NaN
NaN
St. deviation:
NaN
NaN
NaN
NaN
Maximum:
NaN
NaN
NaN
NaN
Minimum:
NaN
NaN
NaN
NaN
Number of data:
NaN
NaN
NaN
NaN
90Percentile:
NaN
NaN
NaN
NaN

 

7.2.2 Trend of daily SATU NEA St. deviation since 1st April 2006 (dark limb) and of daily SATU NEA 90th percentile since May 2011

The long term trend of the SATU 'X' and 'Y' standard deviations should be constant during the whole mission.

The colorbar represents the start tangent altitude (km) of the occultations.

Upper curve: STD of SATU Y axis
Lower curve: STD of SATU X axis

qds_image



Lower curve: 90th percentile of SATU Y axis
Upper curve: 90th percentile of SATU X axis

qds_image


 

8. Auxiliary Data Files used for the production reported in section 2.4

The number reported in the third column indicates since which file (see list in section 2.4) the corresponding
auxiliary file has been used. The fourth column is the date of those product files.

 
Type Auxiliary Filename Used since product Used since product date
INST_PHYS_CHARACTERISTICS
GOM_INS_AXVIEC20111213_163131_20111215_000000_20500101_000000
1
08-APR-2012 00:45:04
CALIBRATION_DATABASE
GOM_CAL_AXVIEC20120316_091957_20120315_000000_20500101_000000
1
08-APR-2012 00:45:04
LEVEL-1B_PROC_CONFIG
GOM_PR1_AXVIEC20110513_081743_20020301_000000_20500101_000000
1
08-APR-2012 00:45:04
STAR_CATALOGUE
GOM_CAT_AXVIEC20020121_161009_20020101_000000_20200101_000000
1
08-APR-2012 00:45:04
STELLAR_SPECTRA_DATABANK
GOM_STS_AXVIEC20091111_151504_20020101_160000_20500101_000000
1
08-APR-2012 00:45:04
ECMWF_FILE
AUX_ECF_AXNECM20120407_062115_20120407_210000_20120408_090000
1
08-APR-2012 00:45:04
ECMWF_FILE
AUX_ECF_AXNECM20120407_183759_20120408_030000_20120408_150000
3
08-APR-2012 04:05:32
ECMWF_FILE
AUX_ECA_AXNECM20120408_062114_20120407_210000_20120408_090000
4
08-APR-2012 05:45:47
OPTIONAL_ECMWF_FILE
MISSING
1
08-APR-2012 00:45:04
ORBIT_DATA_FILE
AUX_FPO_AXVPDS20120407_101927_20120406_182049_20120416_203429
1
08-APR-2012 00:45:04