Simultaneous observations of 46.8-MHz and 430-MHz radar backscatter from HF-induced ionospheric Langmuir turbulence

Details Simultaneous observations of 46.8-MHz and 430-MHz radar backscatter from HF-induced ionospheric Langmuir turbulence Simultaneous observations of 46.8-MHz and 430-MHz radar backscatter from HF-induced ionospheric Langmuir turbulence

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617891s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,891-17,895.

Physics

2

High Frequencies, Ionospheric Disturbances, Plasma Turbulence, Radar Scattering, Backscattering, Electrostatic Waves, Radio Probing

Scientific paper

Simultaneous high-resolution spectra of the upshifted enhanced plasma line were obtained with the 46.8-MHz and 430-MHz Arecibo radars in the presence of HF transmissions at two closely spaced frequencies. The spectra obtained with the 46.8-MHz radar showed two narrow features with positive Doppler shifts equal to the two closely spaced frequencies of the HF transmissions; all the spectral power was contained in those two narrow features. The spectra obtained with the 430-MHz radar showed a single narrow feature with a positive Doppler shift equal to the arithmetic mean of the same two closely spaced frequencies; the spectral power in that narrow feature contained about 3 percent of the total spectral power. The present results broadly confirm the tentative interpretation of earlier observations with a 46.8-MHz radar at Arecibo. The results also show the fundamental difference in the physical processes leading to the enhanced plasma line spectra observed with the two radars.

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