Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0787c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0787
Physics
2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2764 Plasma Sheet, 2799 General Or Miscellaneous, 7827 Kinetic And Mhd Theory
Scientific paper
An important issue in determining the field line resonance in 3D magnetospheric fields is the coupling between shear Alfven waves and slow modes. In MHD theory the coupling is via the geodesic magnetic field curvature and pressure gradient as derived in the paper by Cheng et al. [JGR, 98, 11339, 1993]. The coupling is of particular importance in the plasma sheet region where plasma beta is larger than unity and the geodesic magnetic field curvature can be large. We will present numerical solutions of field line resonances in 3D magnetospheric magnetic field including the coupling effects of shear Alfven waves and slow modes. Including the kinetic effects of finite ion gyroradii and trapped electron dynamics, it has been shown that the parallel electric field and parallel current can be greatly enhanced over the ideal MHD value [Cheng and Lui, GRL, 25, 4091, 1998]. As a result the kinetic effects enhance the field line tension and thus the shear Alfven resonance frequency is greatly increased. A formulation of the field line resonance problem including kinetic effects for the global modes will be presented.
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