Generation and propagation of Pc1-2 waves in the magnetosphere: Effects of heavy ions

Details Generation and propagation of Pc1-2 waves in the magnetosphere: Effects of heavy ions Generation and propagation of Pc1-2 waves in the magnetosphere: Effects of heavy ions

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm41a..03l&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM41A-03

Physics

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2772 Plasma Waves And Instabilities (2471), 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Previous statistical studies show that Pc1-2 waves are found frequently with linear polarization near the equatorial region. Since the dispersion relation indicates that the polarization of most Pc1-2 wave events should be either left-handed or right-handed, it has remained as a long-standing, unanswered question. Our study suggests that these linearly-polarized events are generated by mode conversion of compressional waves into heavy ion resonances, called Buchsbaum-Bers and ion-ion hybrid resonances, which correspond to Alfven resonances in the low frequency limit. We examine how these resonances occur for various heavy ion population and source sizes in detail by performing an accurate calculation on the mode conversion efficiency. The dependence of the efficiency on the relative abundance among different ions is investigated and found to be consistent with observational features. From tha fact that the Buchsbaum-Bers resonance frequency is determined only by the magnetic field and relative population density of heavy ions, we suggest that monitoring the local heavy ion population is possible simply by examining peak frequencies of the linearly polarized wave events.

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