Solar Energetic Particle Acceleration at Coronal Mass Ejection-driven shocks

Details Solar Energetic Particle Acceleration at Coronal Mass Ejection-driven shocks Solar Energetic Particle Acceleration at Coronal Mass Ejection-driven shocks

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh22a..05d&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH22A-05

Physics

2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 7807 Charged Particle Motion And Acceleration

Scientific paper

Coronal Mass Ejection- or CME-driven shocks are presently believed to be the primary cause of the so-called large gradual solar energetic particle (SEP) events and the energetic storm particle (ESP) events observed at Earth. However, despite recent observational and theoretical advances, many important questions regarding such CME-associated particle events remain unanswered. This is because the SEP observations near Earth orbit are smeared by a confluence of numerous poorly understood physical effects all of whose contributions can vary with time and location. These effects include: the origin, structure, and evolution of the CME shocks, the nature of wave-particle interactions and the type of turbulence that is present near the shocks, the distribution and composition of the seed populations, the type of injection and acceleration processes involved and the manner in which the interplanetary medium affects their transport to Earth. In this paper we review SEP measurements from solar cycle 23 in terms of their relationship with CMEs and of our current understanding of the origin, energization, and interplanetary transport of the accelerated particles. We also discuss new opportunities that will be provided by missions such as STEREO in the upcoming solar cycle that will enable us to quantitatively model and predict key properties such as event durations and energy spectra of the accelerated ions.

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