Simulation study for resonant absorption of ULF waves in multi-ion plasmas

Details Simulation study for resonant absorption of ULF waves in multi-ion plasmas Simulation study for resonant absorption of ULF waves in multi-ion plasmas

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm41a..09k&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM41A-09

Physics

2700 Magnetospheric Physics (6939), 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

The inclusion of minor ions changes the dispersion of waves between the ion gyrofrequencies. There are two additional resonances between the gyrofrequencies, Buchsbaum-Bers (BB) resonance when waves are incident perpendicular to the background magnetic field B0 and ion-ion hybrid (IIH) resonance when waves are obliquely incident to B0. By adopting a multi-fluid wave model which can fully include effects of electrons and multi-ions, we show how resonant absorptions occur at the BB and IIH resonances in electron-proton- helium/oxygen plasmas. We present wave spectra and the time histories of the electromagnetic fields at the BB, IIH, and cavity resonances. We also discuss the role of the BB/IIH resonances on propagation and generation of EMIC waves in the magnetosphere. Our results demonstrate that (1) incident fast waves are converted into the BB resonance for k∥ = 0 , where k∥ is the wavenumber parallel to B0, and IIH resonance for k∥ ≠ 0. (2) At the BB resonance, the electrostatic component is growing while other electromagnetic components are damped. (3) At the IIH resonance, for small k∥ value, the electromagnetic transverse components gain the energy from the other component, which is similar to the FLR in the MHD regime. (4) The electromagnetic fields show linear polarization at the IIH resonance.

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