Temporal evolution of HF-enhanced plasma lines

Details Temporal evolution of HF-enhanced plasma lines Temporal evolution of HF-enhanced plasma lines

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2209k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Nov. 1990, p. 2209-2212.

Physics

9

Backscattering, High Frequencies, Ionospheric Heating, Plasma Spectra, Radar Echoes, Earth Ionosphere, Models, Plasma Temperature, Solitary Waves

Scientific paper

A theoretical investigation is conducted of the temporal evolution of HF-enhanced plasma lines (HFPLs). An extended theoretical model is presented which was originally intended to explain the intensity overshoot of the high frequency enhanced plasma line (HFPL). The extension takes into consideration the fact that nonresistant heating of plasma electrons by the parametrically excited Langmuir waves can yield an apparent increment in electron temperature. It is pointed out that the HFPLs refer to the radar echoes at frequencies near the sum and difference of the radar frequency and the HF heater wave frequency. It is suggested that backscatter of radar signals from plasma waves having a wavenumber of 18/m cause the enhanced spectral lines.

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