New Insights on the Sources, Acceleration, and Transport of SEPs Obtained from Ion Composition Measurements

Details New Insights on the Sources, Acceleration, and Transport of SEPs Obtained from Ion Composition Measurements New Insights on the Sources, Acceleration, and Transport of SEPs Obtained from Ion Composition Measurements

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh41b..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH41B-01

Physics

2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 7845 Particle Acceleration, 7859 Transport Processes

Scientific paper

A decade ago there was a general consensus that large Solar Energetic Particle (SEP) events were caused by large shocks that propagated out from the Sun and accelerated particles out of the solar wind. New observations from ACE, Ulysses, SAMPEX, and Wind forced a re-examination of this view when they revealed that the SEP heavy ion composition did not bear any simple relationship to the solar wind composition. In addition, enhanced quantities of 3He, Fe, and high charge state ions were observed in many shock-associated events; this was odd since these ions had previously been believed to be present only in small "impulsive" particle events, a class readily distinguishable from the large shock-associated events. This paper reviews the new ion composition results, and describes recent progress in interpretation of large SEP event spectra and time-intensity profiles in terms of new parameters instead of the traditional MeV/nucleon scale. While much progress has been made at 1 AU, and critical new insights are expected from the soon-to-be launched STEREO mission, we will also show why missions to the inner heliosphere are essential to resolving key issues in SEP acceleration.

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