The role of parametric decay instabilities in generating ionospheric irregularities

Details The role of parametric decay instabilities in generating ionospheric irregularities The role of parametric decay instabilities in generating ionospheric irregularities

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..417k&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 417-423.

Physics

27

Ionospheric Disturbances, Ionospheric Heating, Irregularities, Magnetohydrodynamic Stability, Plasma Waves, Wave Interaction, Electrostatic Waves, Ion Acoustic Waves, Landau Damping, Lorentz Force, Plasma Decay, Wave Dispersion

Scientific paper

Consideration is given to the generation of ionospheric irregularities by the saturated spectrum of parametric decay instabilities acting through purely growing instabilities. The excitation of parametric decay instabilities by O mode heater waves decaying into a saturated spectrum of Langmuir waves is reviewed, and the excitation of purely growing instabilities is analyzed in terms of a four-wave interaction whereby the Langmuir pump wave can excite two daugher Langmuir waves and the ionospheric irregularities (purely growing modes), as in the filamentation instability of Langmuir waves in a magnetized plasma. Nonoscillatory beating currents, differential ohmic heating and the nonlinear Lorentz force are considered as nonlinear effects in the formation of field-aligned irregularities. Results show that a broad spectrum of ionospheric irregularities may be produced with scale lengths from meters to hundreds of meters within seconds under optimum (quiet and spatially uniform) ionospheric conditions.

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