Decay of Alfven-cyclotron waves and kinetic effects on ions in the solar wind

Details Decay of Alfven-cyclotron waves and kinetic effects on ions in the solar wind Decay of Alfven-cyclotron waves and kinetic effects on ions in the solar wind

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh51c..04m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH51C-04

Physics

Plasma Physics

[7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7863] Space Plasma Physics / Turbulence

Scientific paper

Vlasov theory and one-dimensional hybrid simulations are used to study the effects that compressive fluctuations, driven by the parametric instabilities of an Alfven-cyclotron pump wave, have on ion velocity distributions in the solar wind. The resulting longitudinal ion-acoustic waves (IAW) and transverse ion-cyclotron (ICW) waves can selectively destroy the coherent fluid motion of the ions in the pump wave and lead to differential effects. Trapping of the more abundant protons by fast IAWs generates a proton beam with a drift at about the Alfven speed. The major core part of the proton distribution becomes due to phase mixing anisotropic. Because of their larger mass, the alpha particles do not become significantly trapped, but start by conservation of total ion momentum drifting relative to the receding bulk protons. The core protons and alpha particles are differentially heated and accelerated via ICW pitch-angle scattering. We identify key instabilities and find that, even in the parameter regime where fluid theory seems appropriate, kinetic effects prevail.

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