Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh53a1292n&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH53A-1292
Physics
Plasma Physics
[7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Bootstrap shock acceleration of solar energetic particles (SEPs) is intimately coupled to the amplification and damping of Alfvén waves. In steady-state acceleration models, SEPs traveling upstream from the shock resonantly amplify outward propagating Alfvén waves and damp inward propagating Alfvén waves. However, in a time-dependent model that includes pitch-angle evolution, high-energy SEPs are first shock accelerated at large pitch angles and then are scattered to small pitch angles by Alfven waves. In this interaction, contrary to the steady-state scenario, the most energetic SEPs damp outward propagating Alfvén waves and amplify inward propagating waves. We will present results from our time-dependent model of SEP acceleration by parallel coronal shock to illustrate the above process and discuss its implications.
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