Nonlinear processes in the self-focused duct propagation of the whistlers in the magnetosphere

Details Nonlinear processes in the self-focused duct propagation of the whistlers in the magnetosphere Nonlinear processes in the self-focused duct propagation of the whistlers in the magnetosphere

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..655p&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, July 1988, p. 655-661.

Physics

3

Earth Magnetosphere, Wave Propagation, Whistlers, Cyclotron Radiation, Plasma Frequencies, Ponderomotive Forces, Refractivity, Sidebands

Scientific paper

A finite-amplitude whistler wave exerts a ponderomotive force on the electrons, creating a higher-density duct and thus guiding itself to travel to long distances. This duct, however, is unstable to a short-wavelength low-frequency density perturbation, the oscillating two-stream instability. In this process, the whistler pump wave excites a low-frequency perturbation and two lower-hybrid sidebands. The threshold for the instability is determined by the convection losses of sideband energy from the whistler duct. Threshold electric fields for the onset of the instability have been calculated in the magnetosphere for a range of pump frequency.

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