Compressed Archive of LANL GPS Charged-Particle Data

Recently, the National Oceanic and Atmospheric Administration (NOAA) made available to the public a 16-year dataset of measurements of the charged-particle environment at 23 GPS satellites prepared  by the Combined X-Ray Dosimeter (CXD) team at Los Alamos National Laboratory. The dataset comprises a hierarchy of directories that total about 65 GB in size. As the dataset is uncompressed, I have made available a tarred, compressed mirror of the dataset, which is about 5.7 GB in size. This mirror has the MD5 checksum: 443c5787665a9ff7456ca037101b72e0. All the files in the original LANL release are contained in the mirror, without change.
The basic documentation for the dataset is contained in a README file; the following description of the data is taken from that file:

For all satellites except Space Vehicle Navstar (SVN) numbers 41 and 48, the data are:

Variable name	type	Dim.	description
decimal_day	double	1	GPS time, a number from 1 (1-Jan 00:00) to 366 (31-Dec 24:00) or 367 in leap years.
Geographic_Latitude	double	1	Latitude of satellite (deg)
Geographic_Longitude	double	1	Longitude of satellite (deg)
Rad_Re	double	1	(radius of satellite)/Rearth
rate_electron_measured	double	11	Measured rate (Hz) in each of the 11 CXD electron channels
rate_proton_measured	double	5	Measured rate (Hz) in each of the 5 CXD proton channels (P1-P5)
LEP_thresh	double	1	LEP threshold in E1 channels (0 means low, 1 means high)
collection_interval	double	1	dosimeter collection period (seconds)
year	int	1	year (e.g. 2015)
decimal_year	double	1	decimal year = year + (decimal_day-1.0)/(days in year)
SVN_number	int	1	SVN number of satellite
dropped_data	int	1	if =1 it means something is wrong with the data record, do not use it
b_coord_radius	double	1	radius from earth's dipole axis (earth radii)
b_coord_height	double	1	height above the earth's dipole equatorial plane (earth radii)
magnetic_longitude	double	1	Magnetic longitude (degrees)
L_shell	double	1	L_shell (earth radii) – currently this is the same as L_LGM_T89IGRF but this is intended to be our suggested choice for the L shell calculation in the long run.
L_LGM_TS04IGRF	double	1	LanlGeoMag L-shell McIlwain calculation, TS04 External Field, IGRF Internal Field.
L_LGM_OP77IGRF	double	1	LanlGeoMag L-shell McIlwain calculation, OP77 External Field, IGRF Internal Field (not currently filled)
L_LGM_T89CDIP	double	1	LanlGeoMag L-shell McIlwain calculation, T89 External Field, Centered Dipole Internal Field
L_LGM_T89IGRF	double	1	LanlGeoMag L-shell McIlwain calculation, T89 External Field, IGRF Internal Field
bfield_ratio	double	1	Bsatellite/Bequator
local_time	double	1	magnetic local time (0-24 hours)
utc_lgm	double	1	UTC (0-24 hours)
b_sattelite	double	1	B field at satellite (gauss)
b_equator	double	1	B field at equator (on this field line I think) (gauss)
electron_background	double	11	estimated background in electron channels E1-E11 (Hz)
proton_background	double	5	estimated background in proton channels P1-P5 (Hz)
proton_activity	int	1	=1 if there is significant proton activity
proton_temperature_fit	double	1	characteristic momentum -- R0 in the expression given above (MeV/c)
proton_density_fit	double	1	N0 parameter in fit to proton flux ((protons/(cm2 sec sr MeV))
electron_temperature_fit	double	1	electron temperature from a one Maxwellian fit (MeV)
electron_density_fit	double	1	electron number density from a one Maxwellian fit (cm-3)
model_counts_electron_fit_pf	double	11	E1-E11 rates due to proton background based on proton flux fit -- currently not filled (all -1's)
model_counts_proton_fit_pf	double	5	P1-P5 rate from proton fit (using proton_temperature_fit, proton_density_fit)
model_counts_electron_fit	double	11	E1-E11 rates from the 9-parameter electron flux model
model_counts_proton_fit	double	5	P1-P5 rates from electron background -- currently not filled (all -1's)
proton_integrated_flux_fit	double	6	integral of proton flux (based on fit) above 10, 15.85, 25.11, 30, 40, 79.43 MeV (proton kinetic energy)
proton_flux_fit	double	31	intended to be proton flux at 31 energies, not filled currently
proton_fluence_fit	double	6	not filled currently
integral_flux_instrument	double	30	(based on 9 parameter fit) integral of electron flux above integral_flux_energy[i] particles/(cm2 sec)
integral_flux_energy	double	30	energies for the integral of integral_flux_instrument (MeV)
electron_diff_flux_energy	double	15	energies for the fluxes in electron_diff_flux_energy (MeV)
electron_diff_flux	double	15	(based on 9 parameter fit) electron flux at energies electron_diff_flux[i] (particle/(cm2 sr MeV sec))
Efitpars	double	9	fit parameters for 9 parameter electron fit
Pfitpars	double	4	Fit parameters for 4 parameter proton fit. These are still a work in progress. The parameters are here as placeholders until we finalize the fit function and parameters.

    For SVN numbers 41 and 48, the data are:

Variable name	type	Dim.	Description
decimal_day	double	1	GPS time -- a number from 1 (1-Jan 00:00) to 366 (31-Dec 24:00) or 367 in leap years
Geographic_Latitude	double	1	Latitude of satellite (deg)
Geographic_Longitude	double	1	Longitude of satellite (deg)
Rad_Re	double	1	(radius of satellite)/Rearth
rate_electron_measured	double	8	Measured rate (Hz) in each of the 8 BDD electron channels (E1-E8)
rate_proton_measured	double	8	Measured rate (Hz) in each of the 8 BDD proton channels (P1-P8)
collection_interval	double	1	dosimeter collection period (seconds)
year	int	1	year (e.g. 2015)
decimal_year	double	1	decimal year = year + (decimal_day-1.0)/(days in year)
svn_number	int	1	SVN number of satellite
dropped_data	int	1	if =1 it means something is wrong with the data record, do not use it
b_coord_radius	double	1	radius from earth's dipole axis (earth radii)
b_coord_height	double	1	height above the earth's dipole equatorial plane (earth radii)
magnetic_longitude	double	1	Magnetic longitude (degrees)
L_shell	double	1	L_shell (earth radii) -- I do not clearly understand the origin of the calculation, but it seems to be a dipole field/T-89
bfield_ratio	double	1	Bsatellite/Bequator
local_time	double	1	magnetic local time (0-24 hours)
b_sattelite	double	1	B field at satellite (gauss)
b_equator	double	1	B field at equator (on this field line I think) (gauss)
Diffp	double	1	No longer used
sigmap	double	1	No longer used
electron_background	double	8	estimated background in electron channels E1-E8 (Hz)
proton_background	double	8	estimated background in proton channels P1-P8 (Hz)
proton_activity	int	1	=1 if there is significant proton activity
electron_temperature	double	1	electron temperature from a one Maxwellian fit (MeV)
electron_density_fit	double	1	electron number density from a one Maxwellian fit (cm-3)
model_counts_electron_fit	double	8	E1-E8 rates from the 2-parameter Maxwellian fit to the electron data
dtc_counts_electron	double	8	Dead time corrected electron rates (from data, not fit)
integral_flux_instrument	double	30	(based on 2 parameter Maxwellian fit) integral of electron flux above integral_flux_energy[i] particles/(cm2 sec)
integral_flux_energy	double	30	energies for the integral of integral_flux_instrument (MeV)
electron_diff_flux_energy	double	15	energies for the fluxes in electron_diff_flux_energy (MeV)
electron_diff_flux	double	15	(based on 2 parameter Maxwellian fit) electron flux at energies electron_diff_flux[i] (particle/(cm2 sr MeV sec))

Notes (confirmed with the CXD team):

1. Some of the data are given in terms of Earth radii. For the purposes of those measurements, the Earth is assumed to be a sphere of radius 6371 km.
2. A record's timestamp is the time of the centre of the collection interval.
3. Magnetic local time is defined as the difference (in units of time, where 24 hours is equivalent to 360°) between the magnetic longitude of the record and the magnetic longitude of the anti-solar point at the time of the record.