Preliminary Results on Shock-Associated Energetic Particle Events with Focus on Seed Populations

Details Preliminary Results on Shock-Associated Energetic Particle Events with Focus on Seed Populations Preliminary Results on Shock-Associated Energetic Particle Events with Focus on Seed Populations

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41a..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41A-01

Other

2104 Cosmic Rays, 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks

Scientific paper

We examine energetic particle and magnetic fluctuation spectra as measured by the Advanced Composition Explorere (ACE) spacecraft, which are observed in association with interplanetary shocks over the period from 1998 to the present. We characterize the shock parameters as well as the evolving energetic particle and magnetic fluctuation spectra leading up to and following the shock crossing. We divide each observation into background SEP ions and ESP ions that are tied directly to the shock. We assume that the SEP ions were previously shock accelerated, most likely by the same shock, but escaped the confines of the foreshock only to re- encounter the shock at 1 AU. As such, they constitute an energetic background population that the shock is then able to re-accelerate to higher energies. The central question is "What ion population forms the seed population for the bulk of energetic proton events seen in association with the interplanetary shocks. Is it the energetic background of the SEP population, or the cold background of the thermal plasma?" We find instances of both and seek to characterize when one source may dominate over another.

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