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Hourly Averaged Alpha Particle (11-90 MeV/Nuc) Data


Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1975-08-01 to 1992-04-30


This data set was originally written by an IBM 360 computer in EBCDIC and restored on an IBM 9021 computer in ASCII. The tape contains 1 month of data per file. Each record in a file is 60 bytes long. It lists, in sequence, year (last two digits), day number, hour, and spacecraft number (7 or 8 of the IMP series), followed by the hourly averaged flux (1/sq cm-s-sr-Mev) of alpha particles in one of three energy bands. A1 in the sequence denotes the 25-90 MeV band, A2 denotes the 20-25 MeV band, and A3 denotes the 11-20 MeV band. Plots of the data have appeared in the several issues of Solar Geophysical Data-Comprehensive Report, published by NOAA, Boulder, Colorado.

Data are available online at

Alternate Names

  • Hourly Avgd Alpha Part(11-90 MeV)


  • Space Physics: Heliospheric Studies


  • 73-078A-07D

Additional Information



Questions and comments about this data collection can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Mr. Eugene M. MurphyData ProviderUniversity of
Mr. Robert M. CandeyGeneral ContactNASA Goddard Space Flight

Selected References

  • Mason, G. M., and W. W. Mixon, University of Chicago charged particle experiments on IMP-7 and IMP-8 - instrument and data format descriptions, U. of Chicago, Enrico Fermi Inst., Lab. for Astrophys. and Space Res., Preprint No. 75-45, Chicago, IL, July 1975.
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