Height of the HF-enhanced plasma line at Arecibo

Details Height of the HF-enhanced plasma line at Arecibo Height of the HF-enhanced plasma line at Arecibo

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4793m&link_type=abstract

Journal of Geophysical Research, vol. 82, Oct. 1, 1977, p. 4793-4804.

Computer Science

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8

Height, High Frequencies, Ionospheric Heating, Plasma Spectra, Radio Frequency Heating, Airy Function, Electric Fields, Electrostatic Waves, Ionospheric Sounding, Line Spectra, Photoelectrons, Plasma Diagnostics

Scientific paper

In an ionospheric modification experiment at Arecibo in July 1976, involving the HF radiowave heating of the ionosphere, it was found that the height of the enhanced plasma line due to photoelectrons does not agree with the height of the enhanced plasma line due to the HF heating wave. It is shown that the photoelectron enhanced plasma line occurs at the height expected by theory for a uniformly varying ionosphere, while the observed HF plasma line occurs a few kilometers above this height. The Langmuir waves responsible for the observed HF plasma line probably exist near the largest or first maximum of the Airy function, which describes the standing HF electric field, this being about 200 m below the heater wave reflection height.

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