Composition Variations during Large Solar Energetic Particle Events

Details Composition Variations during Large Solar Energetic Particle Events Composition Variations during Large Solar Energetic Particle Events

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..624h&link_type=abstract

SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 624-6

Computer Science

Particle Emission, Solar Wind, Composition, Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

Recent theoretical work has posited that proton-generated Alfvén waves scatter ions according to their rigidity during propagation from the acceleration region to the observed position. In particular, predictions have been made for the initial behavior of the high energy (> 2 MeV/nucleon) He/H and Fe/O ratios during large solar energetic particle (SEP) events based on this theory. In this paper, we have examined the temporal variations of low energy (~0.3 MeV/nucleon) hydrogen, helium and iron ions throughout thirty large SEP events using the ULEIS instrument on the ACE spacecraft. These events originated from different solar longitudes; hence we compare events that have similar magnetic connection to minimize the transport effect. All events exhibited an eventual decrease in the He/H ratio as is suggested by the wave-particle model, but the degree of variation of He/H varies from event to event. However, the time variation of the Fe/O ratio does not correlate at all with that of the He/H in most of the events that we studied.

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