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This folder contains calibrated magnetic field data obtained from the AOCS magnetometer onboard the GRACE-FO satellites  and supporting data.
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The data is provided in NASA CDF format (https://cdf.gsfc.nasa.gov/).
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File name:

For example:
GF2_OPER_FGM_ACAL_CORR_20180601T000000_20180601T235959_0201.cdf

GF2:             GRACE-FO 2 (satellite identifier)
OPER:            operational (delivery mode)
FGM_ACAL_CORR:   Magnetic field data, aligned, calibrated and corrected (data category)
20180601T000000: yyyymmddThhhhhh (time of first entry)
20180601T235959: yyyymmddThhhhhh (time of last entry)
0201:            version 0201 (version identifier)
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Data categories

RAW:        Raw magnetic field data as provided by L1b
ACAL_CORR:  Magnetic field data, aligned, calibrated and corrected
CHAOS7:     CHAOS7 magnetic model predictions for core, crustal and large-scale magnetospheric field
APEX:       Magnetic coordinates (Emmert et al. (2010), https://doi.org/10.1029/2010JA015326)
FAC:        Radial and field-aligned currents derived from magnetic data in ACAL_CORR, v0201 invalid from June 2020, replaced with v0202
PARAM_CAL:  Calibration parameters, monthly values
PARAM_CHAR: Charaterisation parameters, monthly values
ORBCNT:     Preliminary Orbit Counter created from TLE's, https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi
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References:

Michaelis, I., Stolle, C., Rother, M. (2021): GRACE-FO calibrated and characterized magnetometer data. V. 0201. GFZ Data Services. https://doi.org/10.5880/GFZ.2.3.2021.002

Stolle, C., Michaelis, I., Xiong, C. et al. Observing Earth’s magnetic environment with the GRACE-FO mission. Earth Planets Space 73, 51 (2021). https://doi.org/10.1186/s40623-021-01364-w
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License: CC BY 4.0
Changes in processing wrt to reference

from Apr 2021 sklearn.linear_model.LinearRegression is using option (normalize=True)