Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21b0209l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM21B-0209
Physics
2724 Magnetopause, Cusp, And Boundary Layers, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2752 Mhd Waves And Instabilities, 7827 Kinetic And Mhd Theory
Scientific paper
In the plasma sheet boundary layer, the plasma density and the Alfven speed undergo significant variations in order to satisfy the total pressure balance. The inhomogeneity of the plasma pressure and magnetic pressure becomes significant near the plasma sheet boundary layer. We have developed a new three-dimensional MHD wave model that allows for finite plasma pressure. We present the initial results from this numerical model for MHD wave propagation in hot plasmas. Based on this time-dependent model, we study the excitation of ULF modes in the magnetotail. We examine how both shear and fast modes are affected by the plasmasheet and lobe structure. Our results show that localized field-aligned currents are strongly excited at the boundary between the plasma sheet and its surrounding regions. We also discuss and compare our results with observations.
Lee Daehee
Lysak Robert L.
Song Yushu
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