HIIS results on the mean ionic charge state of SEP Fe above 200 MeV per nucleon

Details HIIS results on the mean ionic charge state of SEP Fe above 200 MeV per nucleon HIIS results on the mean ionic charge state of SEP Fe above 200 MeV per nucleon

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374...96t&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 96-105 (1996).

Physics

1

Particle Emission, Solar Wind

Scientific paper

We have analyzed the geomagnetic transmission of solar energetic Fe ions at ~200-600 MeV/nuc during the great solar energetic particle (SEP) events of 1989 September-October. By comparing fluences from the Chicago charged-particle telescope on IMP-8 in interplanetary space and from NRL's Heavy Ions in Space (HIIS) experiment aboard LDEF in low-Earth orbit, we obtain a mean ionic charge =14.2+/-1.4. This result is significantly lower than observed at ~1 MeV/nuc in impulsive events, and suggests that neither acceleration at the flare site nor flare-heated plasma significantly contributes to the high-energy Fe ions we observe. But it agrees well with the observed in gradual SEP events at lower energies, demonstrating that acceleration by CME-driven shocks is the primary SEP production mechanism in gradual events even at these very high energies.

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