Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41b15k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH41B-15
Other
2109 Discontinuities, 2149 Mhd Waves And Turbulence, 7811 Discontinuities, 7867 Wave/Particle Interactions
Scientific paper
Heavy ions in the interplanetary medium show a statistical tendency to stream at the local Alfven speed (VA) relative to protons. Because VA decreases with increasing distance from the Sun, forces must exist to slow the heavier ions to VA with increasing distance. We have conducted hybrid simulations in a plasma with particle protons and alphas and with a quasineutralizing electron fluid. In our simulations, a group of Alfven waves steepen and generate imbedded rotational discontinuities (RDs). Cross-field nonuniformities are also induced by wave nonlinearity. This ultimately brings about a cascade of wave energy to dissipative scales and the dissipation of some of the RDs. When alphas stream at speeds above VA relative to protons, we find that the streaming speed of alphas decreases to approximately VA and the alphas are heated by their interactions with waves and RDs. We present these simulation results and examine the role that wave cascades and RDs can play in regulating streaming speeds and in heating alphas and other heavy ions in the interplanetary medium.
Hollweg Joseph V.
Kaghashvili Edisher
Vasquez Bernard J.
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