High resolution observations of HF-induced plasma waves in the ionosphere

Details High resolution observations of HF-induced plasma waves in the ionosphere High resolution observations of HF-induced plasma waves in the ionosphere

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1893d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1893-1896. Research supported by the Aerospace Corp.

Physics

45

Electrostatic Waves, F Region, Plasma Turbulence, Radar Measurement, High Resolution, Radio Frequency Heating

Scientific paper

Langmuir oscillations excited by a powerful, high-frequency (HF) radio wave reflecting in the F-region have been studied in detail with the 430 MHz radar at Arecibo Observatory, Puerto Rico. Exceptionally good altitude and temporal resolution made it possible to closely examine transient plasma phenomena and allowed very weak plasma features to be seen in the ionosphere. The observations reveal an unexpected richness of complex plasma structure. Langmuir turbulence detected with the 430 MHz radar often occupies an extended altitude interval, particularly during the 'plasma line overshoot' and at late times following HF turn-on. In the late time plasma environment, multiple layers of Langmuir turbulence are often observed. In general, important distinctions can be made between the excitation of Langmuir oscillations in a 'cold' background ionosphere and in an ionosphere 'preconditioned' by prior HF transmissions. The greatest differences are evident in the altitude and range extent of the backscatter measured immediately after HF turn-on.

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