Diagnosis of Heavy Ion Composition by Multi-Ion Hybrid Resonances in Nonuniform Space

Details Diagnosis of Heavy Ion Composition by Multi-Ion Hybrid Resonances in Nonuniform Space Diagnosis of Heavy Ion Composition by Multi-Ion Hybrid Resonances in Nonuniform Space

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm44a..08l&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM44A-08

Physics

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2772 Plasma Waves And Instabilities (2471), 5737 Magnetospheres (2756), 7827 Kinetic And Mhd Theory, 7836 Mhd Waves And Instabilities (2149, 2752, 6050)

Scientific paper

ICRF waves are strongly associated with the presence of heavy ions in the magnetosphere. We investigate the role of heavy ion resonances in nonuniform plasmas. The coupled plasma wave equations are solved in an exact manner to calculate the resonant absorption at the multi-ion hybrid resonance. We 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 background heavy ion composition properties. We examine how these resonances occur for various H+, He+ and O+ populations in detail by performing an accurate calculation on the mode conversion efficiency. Due to the fact that the multi-ion hybrid resonances in cold plasmas are determined by simple parameters such as the fraction of the ion number density of each species and the magnetic field, it is suggested that monitoring the local heavy ion population is possible simply by examining peak frequencies of the linearly polarized wave events in either electric field or magnetic field data.

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