Major solar proton events observed by IMP-8 (from 1973 to present)

Details Major solar proton events observed by IMP-8 (from 1973 to present) Major solar proton events observed by IMP-8 (from 1973 to present)

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3254l&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

4

Scientific paper

The ongoing mission of the IMP-8 spacecraft has generated a uniform and nearly time-continuous database of energetic particle events through solar cycles 21, 22, and the rising phase of solar cycle 23. In this paper we use energetic (48.0-96.0 MeV) proton intensities from the CPME instrument to identify the major solar energetic proton (SEP) events observed during a 27.5-year period (November 1973 - May 2001). We examine their time-intensity profiles and their temporal distribution within the sunspot solar cycles. We compare the two largest SEP events observed so far in solar cycle 23 (i.e., the Bastille Day 2000 event and the November 9, 2000 event) with the other major SEP events observed over the last two solar cycles. The two SEP events in 2000 show the highest intensities ever observed by IMP-8. These data allow us to establish an upper limit on the ˜50-100 MeV SEP intensities observed at 1 AU during the past 27.5 years.

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