Heater enhanced topside plasma line

Details Heater enhanced topside plasma line Heater enhanced topside plasma line

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..977g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Oct. 1983, p. 977, 978.

Physics

4

Ionospheric Propagation, Plasma Heating, Plasma Spectra, Plasmapause, Radio Frequency Heating, Critical Frequencies, F Region, Plasma Waves, Radio Spectra

Scientific paper

In a recent experiment at Arecibo, the ionospheric topside plasma line was enhanced by the high power, high frequency, radiowave, HF heater. The enhancement was a few orders of magnitude over the normal daytime photoelectron-enhanced plasma lines. This is the first observation of an order of magnitude enhancement of the plasma line in the topside ionosphere induced by the heater. The critical frequency of the F-region (f sub zero-F sub two) was reasonably close to the HF heater frequency of 5.1 MHz. Possible explanations include propagation via the magneto-ionic Z-mode with some unkonwn excitation mechanism, some severe inhomogeneities in the ionosphere, or heater-excited electrons streaming upward along the magnetic field lines to excite the plasma.

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