Observations of plasma instabilities in a multiple pump ionospheric heating experiment

Details Observations of plasma instabilities in a multiple pump ionospheric heating experiment Observations of plasma instabilities in a multiple pump ionospheric heating experiment

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..187s&link_type=abstract

Geophysical Research Letters, vol. 5, Mar. 1978, p. 187-190.

Physics

2

Ionospheric Heating, Magnetohydrodynamic Stability, Plasma Spectra, Sidebands, High Frequencies, Incoherent Scattering, Line Spectra, Plasma Oscillations, Pumping, Signal To Noise Ratios

Scientific paper

The response of the ionospheric plasma to multiple pumps is seen in the enhancements of the incoherent-scatter plasma line. Two strong HF pumps are transmitted, along with weaker sidebands. The two main pumps have a frequency separation ranging from 0 to 7 kHz. At zero frequency separation the standard decay and purely growing-mode instabilities are observed. When two pumps are present, the normal decay instability usually disappears and is replaced by strong oscillations at the pump frequencies plus features half-way between pairs of pumps. These 'arithmetic mean' peaks appear in most of the cases observed. The weak transmitted sidebands seem to influence greatly the observed spectra.

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