Auxiliary (AUX) Product Definitions
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.
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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).
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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 |
|
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⇒ 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 |
|
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⇒ 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. |
|
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 second values) |
|
Units |
nT |
|
Resolution |
0.01nT |
|
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 |
< 50Mb/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 |
|
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Links
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