Physics – Plasma Physics
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.5403k&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A3, p. 5403-5410
Physics
Plasma Physics
2
Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Ring Current, Space Plasma Physics: Wave/Wave Interactions
Scientific paper
A coupling mechanism between lower-hybrid waves and low-frequency electromagnetic activity in the Earth's ring current region is analyzed. In the ring current region the observed amplitudes of Alfvén and/or fast magnetosonic waves, as a rule, do not exceed the threshold of flux instability of lower-hybrid waves in an electromagnetic field of a low-frequency wave. Even for these conditions, however, a mechanism of parametric generation of lower-hybrid waves from low-frequency Alfvén or fast magnetosonic waves is possible, and this theory is presented. In the studied case, lower-hybrid waves are saturated because of induced scattering with plasma electrons. For typical plasma and low-frequency wave parameters in the Earth's ring current region the saturation level of lower-hybrid waves, excited by the proposed mechanism, is in good agreement with experimental data.
Gamayunov K. V.
Khazanov George V.
Liemohn Michael W.
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