Composition Variations of Hydrogen Helium and Iron Ions during Large Solar Energetic Particle Events

Details Composition Variations of Hydrogen Helium and Iron Ions during Large Solar Energetic Particle Events Composition Variations of Hydrogen Helium and Iron Ions during Large Solar Energetic Particle Events

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31a06l&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31A-06

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2139 Interplanetary Shocks, 7807 Charged Particle Motion And Acceleration, 7867 Wave/Particle Interactions

Scientific paper

We have examined the temporal variation of ~ 1 MeV/nucleon hydrogen, helium and iron ions in large solar energetic particle (SEP) events from 1997 to the end of 2000 using instruments on ACE spacecraft. Large SEP events are thought to be accelerated by shocks driven by coronal mass ejections. Recent theoretical work has revealed the importance of proton-generated Alfvén waves during shock acceleration. In particular, predictions have been made for the initial behavior of the He/H and Fe/O ratios during large SEP events: different species should scatter differently according to their charge-to-mass ratios [Ng et al., 1999; Reames et al., 2000]. In this paper, we will use data from the ULEIS and EPAM ion detectors on ACE to exam the He/H and Fe/O variations within large SEP events. We have found some events exhibiting initial enhancement of the He/H as is suggested by the wave-particle model. In addition, we will also use the full unit-sphere coverage of the EPAM detector to look at the pitch-angle anisotropy of these large events.

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