High power HF modification: Geophysics, span of EM effects, and energy budget

Details High power HF modification: Geophysics, span of EM effects, and energy budget High power HF modification: Geophysics, span of EM effects, and energy budget

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...15c&link_type=abstract

Advances in Space Research, Volume 13, Issue 10, p. 15-24.

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As the electric field and power density of radio wave (RF) radiation increases continuously in a plasma, the response of the plasma to the incident energy changes discontinuously. This follows from a complex set of competing processes, each generally with its own power dependent threshold, and plasma instabilities, each with their own growth and decay rate. Non-linear power dependencies, and dependencies on boundary conditions, past histories of the plasma conditions, dependence on proximity to plasma resonances, and non-linear mixing in the plasma leading to up or down convertion with respect to resonances, all conspire to make experimental guidance invaluable to theoretical development, and visa versa. Experimental manifestations of RF energy conversion are reviewed here, for the HF power increasing through: passive transmission, to cross-modulation, to thermal bulk heating, to parametric and other instabilities with plasma structuring and stimulated electromagnetic radiation, to electron acceleration and airglow, to reported ionization. Emphasized here is the enormous spectral range of electromagnetic effects, the case for production of ionization, and the need to focus future research on energy budget issues.

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