Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31c..01c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH31C-01
Physics
7513 Coronal Mass Ejections, 7514 Energetic Particles (2114), 7519 Flares, 7534 Radio Emissions, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
During the past 15 years, a new paradigm has been developed for solar energetic particle (SEP) events in which the particles observed in space following solar activity are thought to be accelerated either in flares (small impulsive SEP events with high-Z abundance anomalies and high Fe charge states) or at CME-driven coronal/interplanetary shock waves (large gradual events with "normal" abundances and low Fe charge states). Observations from the Advanced Composition Explorer (ACE), however, have shown that at energies > 10 MeV/amu, certain large gradual events have event-averaged abundances and charge states that look remarkably impulsive (e.g., Cohen et al., GRL 26, 2697, 1999). Recently-analyzed large events observed by the IMP-8 spacecraft since 1973 exhibit similar behavior (Dietrich and Lopate, Proc. 27th ICRC, 8, 3120, 2001). I review the various suggestions that have been made to account for these "mixed" events in terms of propagation effects and/or seed particle populations.
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