This home page provides access to data set which includes the archived data from the Cylindrical Electrostatic Probe (CEP) experiment on the Explorer 31 satellite. It was launched on 1965-11-29 into an elliptical orbit (500 km-3000km) with an inclination of 79.8 degrees.
ASCII data set also contains needed spacecraft position data, IGRF model parameters, and indices.

Time Resolution:1-5 Minutes

This data set and its description placed at SPDFFTP's anonymous FTP site nssdc.gsfc.nasa.gov in directory https://spdf.gsfc.nasa.gov/pub/data/explorer/explorer31/plasma_cep/

Time span of the data set: 1965-10-29 to 1968-08-20

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Enter start and stop dates: year,month,day(YYYYMMDD)
   Start time    Stop time

Select variables

 Local Time
 Geodetic Latitude of the Spacecraft, Degrees
 Geodetic Longitude of the Spacecraft, Degrees
 Geomagnetic Latitude of the Spacecraft, Degrees
 Geomagnetic Longitude of the Spacecraft, Degrees
 Altitude,km
 Dip Latitude, Degrees
 Magnetic inclination (dip), Degrees
 B, Magnetic field strength, 1/100 Gauss 
 L, Invariant Latitude, Degrees, +/-90
 Quality Code for L value
 ZSUN, Solar Zenith Angle, Degrees, 0-180
 ap indices (daily) 
 kp indices (3 hour) 
 F10.7 (solar radio flux, daily)
 Sunspot number (daily)
 Orbit number
 Electron Temperature,K 
 Electron Density (cm-3)
 Satellite potential (mV)

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NASA Official: Robert Candey (Robert.M.Candey@nasa.gov), Head of the Space Physics Data Facility