Temporal evolution of the HF-enhanced plasma line in the Arecibo F region

Details Temporal evolution of the HF-enhanced plasma line in the Arecibo F region Temporal evolution of the HF-enhanced plasma line in the Arecibo F region

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9112089d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Nov. 1, 1986, p. 12089-12107. Research supported by the Aerospace Cor

Physics

54

F Region, Plasma Waves, Power Spectra, Radio Waves, High Frequencies, Landau Damping, Solitary Waves

Scientific paper

The Arecibo HF facility's 430-MHz radar has been used to study the temporal development of the 'HF-enhanced plasma line' (HFPL); attention is presently given to the evolution of the HFPL spectrum after the onset of the HF wave in the F region plasma, with a view to different HF pulse lengths and duty cycles. A diffuse spectral cascade is noted within a few msec of the onset of the HF wave in the plasma, and dominant decay line peaks quickly develop thereafter. It is judged likely that HF-produced small scale cavities and/or HF-induced geomagnetic field-aligned irregularities play a central role in determining the amplitude, spectral signature, and temporal development of strongly excited HFPLs at Arecibo.

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