Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh44a..03d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH44A-03
Physics
2164 Solar Wind Plasma, 2451 Particle Acceleration
Scientific paper
We revisited a theory of Solar Energetic Particles (SEPs) acceleration by shock waves generated from coronal mass ejections. So far the theory has predicted a power law spectrum for accelerated particles, the spectral index being a function of the compression ratio across the shock wave front. We took into account the motion of scattering centers with respect to the plasma. If the energetic protons are mostly scattered by the Alfven turbulence, then the typical speed of waves with respect to the plasma is equal to the Alfven speed. The anisotropy of the turbulence spectrum generated by particles can result in the self- limitation of the acceleration process, degrading the acceleration efficiency and softening the particle spectrum. Under the same circumstances, the quasi-perpendicular shock waves generate a harder spectrum of accelerated particles, as compared to the quasi-parallel ones.
DeZeeuw Darren L.
Gombosi Tamas I.
Sokolov Iu. I.
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