Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm12a..06l&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM12A-06
Physics
2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2753 Numerical Modeling, 2768 Plasmasphere
Scientific paper
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.
Denton R.
Goldstein Jeffrey Jay
Lee Daehee
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