Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326595f&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A11, p. 26595-26606
Physics
Plasma Physics
7
Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Planetary Magnetospheres, Space Plasma Physics: Kinetic And Mhd Theory
Scientific paper
A theoretical approach to the consideration of coupling between Alfvén and compressional modes in two-dimensionally inhomogeneous plasma has been developed. The conversion of a compressional mode, propagating along a high-density layer perpendicular to the magnetic field, into leaking shear Alfvén waves has been considered. The wave spatial structure along the layer is described in WKB approximation. A compressional-type disturbance effectively emitts Alfvén waves when a local resonant condition within the layer is fulfilled. In contrast with the common field line resonance theory, the excited Alfvén modes are assumed to be running away waves but not standing oscillations. The physical situations that correspond to the considered model can be met in the outer near-equatorial magnetosphere, in the exterior cusp region, and in the other magnetospheres such as Jupiter and Saturn.
Fedorov Evgeniy
Mazur Nikolai
Pilipenko Viacheslav
Yumoto Kiyofumi
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