Diffusive shock acceleration and Extreme Solar Energetic Particle Events (Invited)

Details Diffusive shock acceleration and Extreme Solar Energetic Particle Events (Invited) Diffusive shock acceleration and Extreme Solar Energetic Particle Events (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh52a..02l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH52A-02

Physics

Plasma Physics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7851] Space Plasma Physics / Shock Waves, [7959] Space Weather / Models

Scientific paper

It has been argued that the underlying acceleration mechanism in many extreme Solar Energetic Particle (SEP) events is diffusive shock acceleration. Energetic particles in these events often reach ˜ GeV/nucleon in relatively short period of time. This places a strong constraint on the applicability of the diffusive shock acceleration mechanism. In particular, stringent conditions on shock geometry, seed population, and upstream turbulence level must be met in extreme SEP events should diffusive shock acceleration is in operation. I discuss the effect of injection, the seed population, the upstream turbulence wave generated by streaming protons and the behavior of particle motion in the direction perpendicular to the background magnetic field in the diffusive acceleration process. We evaluate the acceleration time scale and the maximum achievable energy at quasi-parallel, quasi-perpendicular and oblique shocks. The implications of these considerations on extremely SEP events will be discussed. Key observational studies on understanding diffusive shock acceleration in SEP events are identified.

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