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Microfilm of Catalog of Solar Cosmic Ray Events (Van Hollebeke et al, X-661-74-27)


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

Time span: 1969-09-09 to 1972-11-29


This data set consists of solar cosmic ray event data plotted on one reel of 35-mm microfilm. The data set is a microfilmed version of the document "A Catalog of Solar Cosmic Ray Events - IMPs 4 and 5 (May 1967 - December 1972)," by M. A. Vanhollebeke, J. R. Wang, and F. B. McDonald (GSFC X-661-74-27, January 1974). The catalog contains plots for about 185 events, with an "event" defined as an increase in the 20- to 80-MeV proton flux which exceeds 0.0001 protons/(cm sq s sr MeV) and lasts for more than 5 hours. The minimum increase over this energy range corresponds to about 5% of the total galactic cosmic-ray flux at 1 AU. The data are presented as hourly-averaged fluxes (10 days per page) for three proton energy intervals (0.9 to 1.6, 6 to 20, and 20 to 80 MeV) and for one electron interval (0.5 to 1.1 MeV). Electron onset times are specified with indicated uncertainties between 3 and 30 min. Proton onset times are specified for events with no discernible electron increases. Data gaps associated with perigee passes and occasional saturation periods are clearly marked.

Alternate Names

  • Solar C.R. Event Catalog, Mfilm


  • Space Physics: Heliospheric Studies


  • 67-051A-09A
  • 67-051A-10A
  • 69-053A-09A
  • 69-053A-10A

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. M.A. I. Van HollebekeData ProviderNASA Goddard Space Flight Center
Dr. M.A. I. Van HollebekeGeneral ContactNASA Goddard Space Flight Center
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