HR: 12:00h
AN: SM12A-06    [Abstracts]
TI: Simulations of MHD waves in the 3-D dipole model with a realistic magnetospheric density profile
AU: * Lee, D
EM: dhlee@khu.ac.kr
AF: Kyung Hee Univ, Dept of Astronomy and Space Sci, Yongin, 449-701 Korea, Republic of
AU: Denton, R
EM: richard.E.denton@dartmouth.edu
AF: Dartmouth College, Dept of Physics and Astronomy 6127 Wilder Laboratory, Hanover, NH 03755 United States
AU: Goldstein, J
AF: Southwest Research Institute, Space Science and Engineering Division, Culebra Rd., San Antonio, TX 78238 United States
AB: In a realistic magnetosphere, the density profile becomes asymmetric in local time. The location of the plasmapause and the density distribution significantly vary with respect to local time, and this asymmetry effect has been neglected in previous magnetospheric ULF wave studies. In this study, we numerically examine the MHD wave properties of field line resonances (FLRs) and Pi2 pulsations when the realistic 3-D density model is assumed. We use the dipole magnetic field model, but our density model is based on observational data from the IMAGE satellite. We assume an impulsive input in the magnetotail, and investigate i) how local FLRs appear in both the radial and azimuthal oscillations owing to the asymmetry and ii) how plasmaspheric Pi2 signals appear in this case. Our results show that the polarization of FLRs becomes mixed owing to the asymmetry and Pi2 pulsation are strongly affected by ambient plasmaspheric structure for different local times. We compare our results with the observational data of Pi2 events.
DE: 2730 Magnetosphere--inner
DE: 2752 MHD waves and instabilities
DE: 2753 Numerical modeling
DE: 2768 Plasmasphere
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting