Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh52a..06g&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH52A-06
Physics
2471 Plasma Waves And Instabilities (2772), 2483 Wave/Particle Interactions (7867), 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
Cyclotron resonances are the fundamental wave-particle interaction between ions and Alfvén-cyclotron fluctuations at sufficiently short wavelengths and at propagation approximately parallel or antiparallel to a background magnetic field B_o in a relatively uniform, collisionless plasma. Cyclotron resonance enables pitch-angle scattering, typically leading to changes in the perpendicular (to B_o) energies of that species. If alpha particles are a minority ion, the proton and alpha resonance conditions are sensitive functions of the alpha/proton relative speed vα p} parallel or antiparallel to Bo. The research described here utilizes ensembles of hybrid simulations in which damped Alfvén-cyclotron fluctuations are imposed upon a steady, homogeneous plasma characterized by average solar wind parameters near 1 AU and bearing both protons and alpha particles. The simulations yield ion species responses to such fluctuations as functions of three parameters: the initial vα p/vA (where vA is the Alfvén speed), the initial magnitude of the applied fluctuating magnetic field energy density, and the relative density of the alphas. For average solar wind conditions near Earth, if magnetic power spectra extend to sufficiently short wavelengths, saturation of alpha scattering is most likely due to exhaustion of the fluctuating field energy density.
Gary Peter S.
Winske Dan
Yin Luiguo
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