Heavy Ion Effects on Resonant Absorption at Mercury's Magnetosphere

Details Heavy Ion Effects on Resonant Absorption at Mercury's Magnetosphere Heavy Ion Effects on Resonant Absorption at Mercury's Magnetosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p31a..02k&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #P31A-02

Physics

2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 6235 Mercury

Scientific paper

When an incident compressional wave propagates across an Alfven velocity gradient in multi-fluid plasmas, the compressional wave can couple with the Alfven resonance for lower frequency and/or the ion-ion hybrid (IIH) resonance for higher frequency. Recently, a wave simulation in electron-hydrogen-sodium plasmas suggested that the field line resonance at Mercury is expected to occur when the IIH and/or Alfven resonance conditions are satisfied. However, the relative efficiency of wave energy absorption at these resonances has not been studied in the context of Mercury's magnetosphere. To understand the efficiency of wave absorption, we evaluate absorption coefficients at the IIH and Alfven resonances for variable concentrations of sodium, ηNa = NNa / Ne, where Nj is number density for particle species j, and azimuthal wave number, ky. When the compressional wave encounters a single resonance (the Alfven or IIH resonances), wave absorption at the Alfven resonance occurs in wide range of ηNa and ky RM ≥ 1, where RM is Mercury's radii, but the absorption at the IIH resonance occurs in narrow range of 0.15< ηNa < 0.55 and ky RM ≤ 1. We also present the absorption when the compressional waves from low magnetic field side encounter both the IIH and Alfven resonances and compare the results with for single resonance cases.

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