Resonant absorption of ULF waves near the ion cyclotron frequency: A simulation study

Details Resonant absorption of ULF waves near the ion cyclotron frequency: A simulation study Resonant absorption of ULF waves near the ion cyclotron frequency: A simulation study

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30xssc3k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. SSC 3-1, CiteID 2240, DOI 10.1029/2003GL017918

Physics

Plasma Physics

6

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Waves And Instabilities, Planetology: Solar System Objects: Mercury, Space Plasma Physics: Waves And Instabilities

Scientific paper

We present a numerical investigation of Alfven resonances when frequencies are comparable to the ion cyclotron frequency(ωci) and MHD approximations become no longer valid. We have developed a three-dimensional multi-fluid wave model, which can fully include the effects of multi-ions and electron. We use simple box model of an inhomogeneous plasma to examine how wave coupling properties change when the characteristic MHD resonance modes become comparable to ωci. The wave spectra and energy relations are presented for both MHD waves and ion cyclotron waves. Our results show that previous resonant absorption in pure MHD waves is well confirmed in the multi-fluid model. By adopting a set of new eigenmodes, we show that the resonant absorption persists even for the higher frequency. It is suggested that, near ωci, the left-handed circularly polarized mode is likely to behave as a shear mode in the MHD limit.

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