Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21b1616b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21B-1616
Physics
2114 Energetic Particles (7514), 4455 Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852), 7845 Particle Acceleration
Scientific paper
The detailed dynamics of pickup ion reflection from the electrostatic potential of a perpendicular collisionless shock is treated at the test particle level. Both shell and filled-shell distributions are considered, the first being a simplification model for the distribution of pickup ions that have been pitch-angle-scattered onto a bispherical shell in velocity space associated with backward and forward traveling Alfvén waves; the second is an extension of the shell but with the interior of the sphere filled in according to the isotropic solar wind, cold neutral gas model of the PUI velocity distribution. Both shell and fill-shell PUI distributions are energized by multiply ion reflection from the cross-shock potential. Efficiently energized hard power law spectra with maximum energy gain depending on the narrowness of the ramp width of the cross shock potential are found. Energized filled-shell spectra are found to be more smooth and, in some narrow ramp cases, more physically plausible then shell.
Burrows Ross Hrant
Dasgupta Basudeb
Webb Gary M.
Zank Gary P.
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