Physics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1299t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 15, Oct. 1988, p. 1299-1302.
Physics
2
Earth Magnetosphere, Ponderomotive Forces, Sidebands, Whistlers, Current Density, Nonlinear Equations
Scientific paper
A mechanism to explain the observed sidebands of whistler waves is proposed. The mechanism involved the modulation of plasma density by the nonlinear mixing of two whistler waves with nearly equal frequency and forward- and backward-traveling components. In conjunction with the oscillatory electron velocity at the wave frequencies, the mixing generates a nonlinear current driving first-order sidebands. In the presence of low-frequency density modulation, the oscillatory velocities at first-order sidebands generate second-order sidebands. This process continues to generate higher-order sidebands. A quantitative estimate of whistler sideband excitation is presented. It is suggested that the mechanism is effective for large-amplitude waves.
Patel Vithal L.
Tripathi Vijai K.
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