Physics – Plasma Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11311212l&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A11, CiteID A11212
Physics
Plasma Physics
2
Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Plasma Waves And Instabilities (2471), Planetary Sciences: Fluid Planets: Magnetospheres (2756), Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Mhd Waves And Instabilities (2149, 2752, 6050)
Scientific paper
Pc1-2 ULF waves are strongly associated with the presence of various ions in the magnetosphere. We investigate the role of heavy ion resonances in nonuniform plasmas near the equatorial region. By adopting the invariant imbedding method, the coupled plasma wave equations are solved in an exact manner to calculate the resonant absorption at the ion-ion hybrid resonance. Our results show that irreversible mode conversion occurs at the resonance, which absorbs the fast wave energy. It is found that waves near the resonances appear with linear polarization, and their amplitude and frequency are sensitive to the properties of the heavy ion plasma composition. We examine how these resonances occur for various H+-He+ populations in detail by performing an accurate calculation of the mode conversion efficiency. Because the multi-ion hybrid resonance locations in cold plasmas are determined by simple parameters, such as the fraction of the ion number density of each species and the magnetic field, we suggest that it is possible to monitor heavy ion composition by examining the peak frequencies of linearly polarized wave events in either electric field or magnetic field spectral data.
Johnson Jay Robert
Kim Kang-Soo
Kim Kyounghee
Lee Dong Hwan
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