Heavy ion effects on wave absorption at the magnetosphere

Details Heavy ion effects on wave absorption at the magnetosphere Heavy ion effects on wave absorption at the magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1767p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1767

Physics

2700 Magnetospheric Physics (6939), 2724 Magnetopause And Boundary Layers, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling

Scientific paper

Recent ion composition measurements near the magnetopause have shown that heavy ionospheric ions can dominate the mass density as much as 30 percent of the time. Heavy ions also significantly modify mode conversion of low frequency compressional waves to kinetic Alfven waves by introducing the ion-ion hybrid resonance (IIH) and Buchsbaum (BB) resonance in addition to the Alfven resonance, which increases the efficiency of mode conversion in the Pc3 frequency range at the magnetopause. 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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