Space Weather Prediction Center (SWPC) 
               GOES Magnetospheric Energetic Particle Data Lists  

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GOES ascii data files use the file naming convention 'Gp' for Primary and
'Gs' for Secondary GOES data. 

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This directory contains GOES Magnetospheric Energetic Particle Data 
Lists with 1-min data for the SWPC primary and secondary GOES satellites. 

The files are updated every 1-minute.

Files with no date in the filename contain data for the last 2 hours. 
Users retrieving data frequently are asked to use these files.

The file format follows a standard data list conventions where header 
lines start with either # or :. 

Filenames include a 'p' for the Primary and 's' for the Secondary 
SWPC GOES satellite. The satellite number, i.e. GOES-15, is in the 
Data List file header. 

Naming Convention:
  e.g. Gp_magnetospheric_particles_ts1.txt  - This is the file 
  for telescope 1 from the Primary GOES satellite for particles.
  There are nine telescopes for each detector.

Date/times
   Dates are shown as year month day (2006 02 06) and an SWPC
   "Modified Julian Day (MJD). The SWPC MJD for Jan 1, 2004 is 53005 
   
   Time is shown as HourMin (1900) and seconds of the day (68400)

   See http://www.swpc.noaa.gov/Data/goes.html the SWPC GOES 
   Satellite News web page 

  GOES data are archived at the National Geophysical Data Center
  http://www.ngdc.noaa.gov/stp


   ******************************************************************
   ** Please read the SWPC Disclaimer at http://www.swpc.noaa.gov/ **
   ******************************************************************

   SWPC provides near-real-time and recent data, solar and geomagnetic 
   indices and solar event reports created from preliminary reports. 
   Preliminary data may contain errors or be revised after further 
   review. The historical products in this SWPC Warehouse are the 
   preliminary reports as originally published. SWPC does not encourage 
   the use of preliminary data for research purposes. 
   
   Links to on-line data at SWPC and archive sites with final data:
                    http://www.swpc.noaa.gov/Data/
   ****************************************************************** 


Please send comments and questions to SWPC.CustomerSupport@noaa.gov

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Description of SWPC Magnetospheric Particle Text Lists

The Magnetospheric Electron Detector (MAGED) and Magnetospheric Proton Detector (MAGPD) 
each consist of nine identical solid-state-detector telescopes (numbered 1-9), 
oriented in different directions.  
Each telescope measures a spectrum of electrons or protons in five energy channels. 
 
Electrons:
E1	30-50 keV	center = 40 keV
E2	50-100 keV	center = 75 keV
E3	100-200 keV	center = 150 keV
E4	200-350 keV	center = 275 keV
E5	350-600 keV	center = 475 keV
Protons:
P1	80-110 keV	center = 95 keV
P2	110-170 keV	center = 140 keV
P3	170-250 keV	center = 210 keV
P4	250-350 keV	center = 300 keV
P5	350-800 keV	center = 575 keV
The measured count rates are corrected for dead time and converted to fluxes.  
The 1-minute averages are corrected for contamination by the other species 
(electrons by protons, protons by electrons). 
The orientation of the spacecraft is indicated every 5 minutes by a ‘0’ or a ‘1’. 
Knowing the orientation of the spacecraft and the number of the telescope, the central 
pitch angle for a telescope can be calculated from the 1-minute magnetic field Hp, He and Hn 
components measured by the same satellite.  

Given:
s35 = sin(35 deg)
c35 = cos(35 deg)
s70 = sin(70 deg)
c70 = cos(70 deg)

If the orientation flag is ‘0’:

Pitch angle (telescope 1) = arccos(He/Ht)
Pitch angle (telescope 2) = arccos(( s35*Hn + c35*He)/Ht)
Pitch angle (telescope 3) = arccos((-s70*Hn + c70*He)/Ht)
Pitch angle (telescope 4) = arccos((-s35*Hn + c35*He)/Ht)
Pitch angle (telescope 5) = arccos(( s70*Hn + c70*He)/Ht)
Pitch angle (telescope 6) = arccos((-s35*Hp + c35*He)/Ht)
Pitch angle (telescope 7) = arccos(( s70*Hp + c70*He)/Ht)
Pitch angle (telescope 8) = arccos(( s35*Hp + c35*He)/Ht)
Pitch angle (telescope 9) = arccos((-s70*Hp + c70*He)/Ht)

If the orientation flag is ‘1’:

Pitch angle (telescope 1) = arccos(He/Ht)
Pitch angle (telescope 2) = arccos((-s35*Hn + c35*He)/Ht)
Pitch angle (telescope 3) = arccos(( s70*Hn + c70*He)/Ht)
Pitch angle (telescope 4) = arccos(( s35*Hn + c35*He)/Ht)
Pitch angle (telescope 5) = arccos((-s70*Hn + c70*He)/Ht)
Pitch angle (telescope 6) = arccos(( s35*Hp + c35*He)/Ht)
Pitch angle (telescope 7) = arccos((-s70*Hp + c70*He)/Ht)
Pitch angle (telescope 8) = arccos((-s35*Hp + c35*He)/Ht)
Pitch angle (telescope 9) = arccos(( s70*Hp + c70*He)/Ht)