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Bennett Ion Mass Spectrometer Data


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1970-07-01 to 1970-12-31


This data set, provided by the principal investigator, consists of ion-mass spectrometer measurements on binary magnetic tapes created on an IBM 360 computer. Each file consists of data for one day. The first record of each file is a 68-byte label record containing the year and day at start of pass; universal and local time (in milliseconds of day) of equator crossing; orbit number; universal time (in milliseconds of day) for pass start and end; orbit direction code; equator crossing code; Kp at time of equator crossing; max Kp in 24 hours preceding the pass; time of max Kp; altitude at equator crossing; geodetic longitude; declination of sun; and alpha (angle between sun-earth line and plane of dipole equator). The data records contain a variable number of 68-byte records consisting of ion-mass code; year, day of year, and universal time in milliseconds of day; eclipse flag (0 = not in eclipse, 1 = in eclipse); density; current; volts; spacecraft charge; OPEP shaft angle; velocity; altitude; geodetic latitude and longitude; geomagnetic latitude; McIlwain's L-shell parameter for the true geomagnetic field; and magnetic local time in seconds of day.


  • Space Physics: Ionospheric Studies


  • 69-051A-05A

Additional Information



Questions or comments about this data collection can be directed to: Dr. Dieter K. Bilitza.



NameRoleOriginal AffiliationE-mail
Mr. Harry A. Taylor, Jr.General ContactNASA Goddard Space Flight Center 
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