Contents
Specification of Auxiliary Products Product Name Convention Product Classification Auxiliary Products AUX_OBS_2_ AUX_OBSM2_ AUX_OBSS2_

Specification of Auxiliary Products

This section describes the product name convention and the product classification.

Product Name Convention

According to [AD-13], Swarm product names consist of 10 digits, which are subdivided into two sub-fields as follows: TTTTTTTTTT = FFFFDDDDDD, where FFFF = File Category and DDDDDD = Semantic Descriptor. For Level 2 (L2) products FFFF = FFFx, where FFF describes the product type (e.g. AUX - Auxiliary Product) and for the single satelitte x = A, B or C for Swarm A, Swarm B, or Swarm C, respectively. If the product is derived from (available for) the satellite constellation (e.g. A and C) x = _. For more information see L2 Product Name Convention.

Product Classification

AUX Products: These products are necessary prior or during processing of high precision Swarm L2 products (see L2 Product Definitions) but do not result from the Swarm L0 or L1b processor. Auxiliary products are further classified in auxiliary models and auxiliary data. For auxiliary products that are needed in Cat-1 as well as in Cat-2 chains (see Product Classification), two different products are defined. The name of all Cat-2 auxiliary products end with the letter F – Fast track (see Product Classification).

Auxiliary Products

Complete information about the auxiliary products can be found in the following document: "Product specification for L2 Products and Auxiliary Products".

? AUX_OBS_2_

Product identifier	`AUX_OBS_2_`
Definition	Geomagnetic Observatory Data are hourly means of the three components of the Earth's magnetic field measured at magnetic observatories, in geocentric (North-East-Centred) coordinates. More details on data processing can be found in [RD-20].
Application	Comprehensive Inversion chain products, `MIO_SHAi2D, MMA_SHA_2F, MCO_VAL_2_, MIO_VAL_2_`
Spatial representation	Values at about one hundred magnetic observatories at the Earth's surface
Time representation	Time series (1 hour averages)
Units	nT
Resolution	0.1nT
Quality indicator	The ‘Quality' channel identifies data as INTERMAGNET ‘Quasi-definitive' (available within three months) or ‘Definitive' (available after about one year). See intermagnet.org for details.
Data volume	< 150Mb/yr
Data format	ASCII listing (others) Example: #Observatory hourly mean values selected from WDC Edinburgh/INTERMAGNET #File created on 6 2 2012 #obs gc_lat long rad yyyy mm dd UT N=-Btheta E=Bphi C=-Br ######################################################################## #AAE1 AAE1 8.974 38.767 6380.055 1998 1 1 0.5 35961.0 NaN 968.0 AAE1 8.974 38.767 6380.055 1998 1 1 1.5 35960.0 746.0 968.0 .... AAE1 8.974 38.767 6380.055 1998 12 31 22.5 35987.0 758.0 1036.0 AAE1 8.974 38.767 6380.055 1998 12 31 23.5 35988.0 756.0 1036.0 #ABK0 ABK0 68.218 18.817 6360.064 1998 1 1 0.5 11466.0 966.0 51282.0 ABK0 68.218 18.817 6360.064 1998 1 1 1.5 11467.0 965.0 51281.0 .... Format description: Variable number of header lines each starting with ‘#'. Note, embedded header lines expected, such as introducing a next station (see example above) Missing value flag = NaN Column Format Description ====== ====== =========== 1-4 s4 3-letter IAGA code, followed by digit 5-12 f8.3 geocentric latitude (degrees) 13-20 f8.3 geocentric longitude (degrees) 21-39 f9.3 radius (km) 30-34 i5 year 35-37 i3 month 38-40 i3 day 41-45 f5.1 UT (hours) 46-54 f9.1 North (-B_theta) component (nT) 55-63 f9.1 East (B_phi) component (nT) 64-72 f9.1 Centered (-B_r) component (nT)
Update rate	Every 3 months
Latency	3 months for quasi-definitive – 1-2 years for definitive
Availability	BGS: ftp://ftp.nerc-murchison.ac.uk/geomag/Swarm/AUX_OBS/
Notes

? AUX_OBSM2_

Product identifier AUX_OBSM2_

Definition Geomagnetic Observatory Data are 1 minute means of the three components of the Earth's magnetic field measured at magnetic observatories, in geocentric (North-East-Centred) coordinates.

Application Comprehensive Inversion chain products, MIO_SHAi2D, MMA_SHA_2F, MCO_VAL_2_, MIO_VAL_2_

Spatial representation Values at about one hundred magnetic observatories at the Earth's surface

Time representation Time series (1 minute averages)

Units nT

Resolution 0.1nT

Quality indicator The ‘Quality' channel identifies data as INTERMAGNET ‘Quasi-definitive' (available within three months) or ‘Definitive' (available after about one year). See intermagnet.org for details.

Data volume < 3Mb/day

Data format

CDF

Field name	Type	Unit	Contents
IAGA_code	CDF_CHAR	-	IAGA three letter observatory identification code associated with datum
Quality	CDF_CHAR	-	Data quality: D for definitive and Q for quasi-definitive
Timestamp	CDF_EPOCH	-	Date and time
Longitude	CDF_DOUBLE	deg	Longitude
Latitude	CDF_DOUBLE	deg	Geocentric latitude
Radius	CDF_DOUBLE	m	Radius
B_NEC	CDF_DOUBLE	nT	Geocentric-north, east, and geocentric-down component of magnetic field. NaN values are used as placeholders for missing data

Update rate Daily

Latency 4-days, 1-, 3-, 6-months, 1-, 2- and 4-years

Availability BGS: ftp://ftp.nerc-murchison.ac.uk/geomag/Swarm/AUX_OBS/

Notes

? AUX_OBSS2_

Product identifier AUX_OBSS2_

Definition Geomagnetic Observatory Data are 1 second values of the three components of the Earth's magnetic field measured at magnetic observatories, in geocentric (North-East-Centred) coordinates.