Theoretical model for long time stimulated electromagnetic emission generation in ionospheric radio modification experiments

Details Theoretical model for long time stimulated electromagnetic emission generation in ionospheric radio modification experiments Theoretical model for long time stimulated electromagnetic emission generation in ionospheric radio modification experiments

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10314711m&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A7, p. 14711-14730

Physics

Plasma Physics

13

Ionosphere: Plasma Waves And Instabilities, Space Plasma Physics: Active Perturbation Experiments, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Radiation Processes

Scientific paper

Experimental evidence points toward magnetic-field-aligned small-scale plasma density striations as responsible for the long time features of stimulated electromagnetic emissions (SEE) in ionospheric radio modification experiments. This paper emphasizes that such striations act as resonators for the generation of trapped upper hybrid oscillations. The sidebands observed in long time SEE experiments are associated with nonstationary behavior, such as parametric instabilities, of these trapped oscillations. A theoretical model for this is formulated and studied numerically. Source spectra for SEE generation, consistent with the main properties of observed downshifted maximum and broad continuum features, will be presented. The first is associated with a trapped oscillations decay instability, while the latter is associated with cavitation in the pre-formed striations.

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