Mathematics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.148..123m&link_type=abstract
In ESA Magnetospheric Boundary Layers p 123-127 (SEE N80-13529 04-42)
Mathematics
Boundary Layer Plasmas, Earth Magnetosphere, Ionic Waves, Wave Propagation, Magnetic Resonance, Magnetopause, Plasma Density, Plasmapause, Poynting Theorem, Singularity (Mathematics)
Scientific paper
The propagation characteristics of ion-cyclotron waves in a magnetized plasma in which the plasma density varies in a direction perpendicular to that of the ambient magnetic field is investigated. It is shown that such waves are trapped between a reflecting layer and a critical layer. Near the latter level, the wave field becomes large and across this level the Poynting flux jumps discontinuously from one constant value to another, with the implication that the plasma absorbs wave energy in the vicinity of a critical level. It is demonstrated that critical level behavior and field line resonance are related, but inversely, both arising from the same singularity in the governing wave equation. The relevance of critical level behavior to ion-cyclotron waves propagating in the vicinity of the plasmapause and magnetopause is discussed.
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