Observations of HF-enhanced plasma line with a 46.8-MHz radar and reinterpretation of previous observations with the 430-MHz radar

Details Observations of HF-enhanced plasma line with a 46.8-MHz radar and reinterpretation of previous observations with the 430-MHz radar Observations of HF-enhanced plasma line with a 46.8-MHz radar and reinterpretation of previous observations with the 430-MHz radar

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2083f&link_type=abstract

Journal of Geophysical Research, vol. 88, Mar. 1, 1983, p. 2083-2092. Research supported by the Norwegian Marshall Fund and Nor

Computer Science

Sound

20

F Region, High Frequencies, Ionospheric Sounding, Line Spectra, Plasma Spectra, Radar Measurement, Electrostatic Waves, Fast Fourier Transformations, Plasma Density, Radar Echoes, Ray Tracing

Scientific paper

Observations of the 5.1 MHz HF transmissions below the F region penetration frequency are presented. The observations were obtained by the radar echoes coming from F region heights at a frequency of 46.8 + 5.1 equals 51.9 MHz which were received while a VHF radar using the 305 m spherical reflector at Arecibo was transmitting pulses coherently on 46.8 MHz. The bandwidth of the echoes was determined to be less than 10 Hz. No decay line due to the parametric decay instability was observed at about a 300 Hz lower frequency. It is suggested that these observations can be explained by the density variations caused by the pondermotive force resulting from the standing pattern at 5.1 MHz. Previous observations with the 430 MHz radar are reevaluated in the light of these new observations.

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