HR: 0800h
AN: SM21A-0463    [Abstracts]
TI: Effects of heavy ions on ULF waves in the magnetosphere
AU: * Kim, E
EM: ehkim@khu.ac.kr
AF: Department of Astronomy and Space Science, Kyung Hee University, Yongin, Kyunggi, 449701 Korea, Republic of
AU: Lee, D
EM: dhlee@khu.ac.kr
AF: Department of Astronomy and Space Science, Kyung Hee University, Yongin, Kyunggi, 449701 Korea, Republic of
AB: We present a simulation study of the propagation of ULF waves in the magnetosphere when multi-ions such as helium and oxygen ions are present. Since the inclusion of multi-ions facilitates the propagation of waves for the band of frequency below each ion gyro-frequency, a multi-fluid treatment is required. We adopt a three-dimensional multi-fluid model, which can fully include the effects of multi-ions and electron. In a box model of an inhomogeneous plasma, we examine the resonant absorption through mode conversion when the MHD approximations break down. The wave spectra and energy relations are presented for ion cyclotron waves of helium and oxygen ions. In addition, the role of plasma composition in the wave coupling problem is investigated in detail. We discuss and compare our results with the previous theoretical and numerical studies.
DE: 2700 MAGNETOSPHERIC PHYSICS
DE: 2753 Numerical modeling
DE: 2772 Plasma waves and instabilities
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting