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 (1Jan 00:00) to 366 (31Dec 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 (P1P5) 
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_day1.0)/(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 Lshell McIlwain calculation, TS04 External Field, IGRF Internal Field. 
L_LGM_OP77IGRF  double  1  LanlGeoMag Lshell McIlwain calculation, OP77 External Field, IGRF Internal Field (not currently filled) 
L_LGM_T89CDIP  double  1  LanlGeoMag Lshell McIlwain calculation, T89 External Field, Centered Dipole Internal Field 
L_LGM_T89IGRF  double  1  LanlGeoMag Lshell McIlwain calculation, T89 External Field, IGRF Internal Field 
bfield_ratio  double  1  Bsatellite/Bequator 
local_time  double  1  magnetic local time (024 hours) 
utc_lgm  double  1  UTC (024 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 E1E11 (Hz) 
proton_background  double  5  estimated background in proton channels P1P5 (Hz) 
proton_activity  int  1  =1 if there is significant proton activity 
proton_temperature_fit

double  1  characteristic momentum  R_{0} in the expression given above (MeV/c) 
proton_density_fit  double  1  N_{0} parameter in fit to proton flux ((protons/(cm^{2} 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  E1E11 rates due to proton background based on proton flux fit  currently not filled (all 1's) 
model_counts_proton_fit_pf  double  5  P1P5 rate from proton fit (using proton_temperature_fit, proton_density_fit) 
model_counts_electron_fit  double  11  E1E11 rates from the 9parameter electron flux model 
model_counts_proton_fit  double  5  P1P5 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/(cm^{2} 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/(cm^{2} 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. 
Variable name  type  Dim.  Description 
decimal_day 
double

1  GPS time  a number from 1 (1Jan 00:00) to 366 (31Dec 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 (E1E8) 
rate_proton_measured  double  8  Measured rate (Hz) in each of the 8 BDD proton channels (P1P8) 
collection_interval  double  1  dosimeter collection period (seconds) 
year  int  1  year (e.g. 2015) 
decimal_year  double  1  decimal year = year + (decimal_day1.0)/(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/T89 
bfield_ratio  double  1  Bsatellite/Bequator 
local_time  double  1  magnetic local time (024 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 E1E8 (Hz) 
proton_background  double  8  estimated background in proton channels P1P8 (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  E1E8 rates from the 2parameter 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/(cm^{2} 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/(cm^{2} sr MeV sec)) 
Notes (confirmed with the CXD team):
 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.
 A record's timestamp is the time of the centre of the collection interval.
 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 antisolar point at the time of the record.
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