Variability in Elemental Composition in Large Solar Particle Events of Cycle 23

Details Variability in Elemental Composition in Large Solar Particle Events of Cycle 23 Variability in Elemental Composition in Large Solar Particle Events of Cycle 23

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh42b..05t&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH42B-05

Physics

7513 Coronal Mass Ejections, 7514 Energetic Particles (2114), 7851 Shock Waves, 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536)

Scientific paper

Through December 2001, Cycle 23 has produced ~45 large solar energetic particle (SEP) events, in which the proton intensity above 10 MeV exceeds galactic background rates by a factor of at least 104. We use these events to make a systematic study of SEP elemental composition in Cycle 23. Preliminary results show no strong evidence for systematic differences between the early and later phases of Cycle 23, at least in data at ~5-10 MeV/nucleon, the same energy range as used for most previous studies of SEP composition. However, comparing events over the wide range of energies covered by various instruments on Wind and ACE reveals a number of acceleration, transport, and seed population effects which are strongly dependent on the species' charge-to-mass (Q/A) ratio. We will discuss these effects and their potential importance for understanding the relative roles of flares and fast CMEs in producing large SEP events. We will also compare results from Cycle 23 with elemental composition results from Cycles 21 and 22.

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