Time variations of HF-induced plasma waves

Details Time variations of HF-induced plasma waves Time variations of HF-induced plasma waves

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..623s&link_type=abstract

Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 623-628.

Physics

20

High Frequencies, Ionospheric Heating, Plasma Waves, Radio Frequency Heating, Spread F, Electron Energy, Plasma Heating, Plasma Spectra

Scientific paper

An HF pump is used to generate intense plasma waves in an ionospheric heating experiment, and variations in plasma lines on time scales of seconds and milliseconds are studied. The waves are observed as enhancements to the ion and plasma lines of the incoherent backscatter echo. On time scales of seconds overshoots in instability power are noted to occur frequently (but not universally) and to last for 1-6 seconds. This phenomenon is related to scattering of the pump by pump-induced irregularities before the pump wave arrives at the instability altitude. Instabilities are detected 2-4 ms after the pump wave turn-on. A decay mode is present along with a broad featureless noise bump which evolves into a line. It is felt that changes in spectral shape occurring upon pump turn-on may be applicable to studies of the saturation mechanism of parametric instabilities.

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