Studies of the self-focusing instability at Arecibo

Details Studies of the self-focusing instability at Arecibo Studies of the self-focusing instability at Arecibo

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2093f&link_type=abstract

Journal of Geophysical Research, vol. 88, Mar. 1, 1983, p. 2093-2102.

Physics

38

Ionospheric Electron Density, Ionospheric Heating, Magnetohydrodynamic Stability, Radio Frequency Heating, Self Focusing, Frequency Response, Radar Measurement, Reflected Waves, Satellite Observation, Signal Fading

Scientific paper

Precisely simultaneous radar and satellite measurements at the altitude of reflection of a strong HF heating wave above the Arecibo Observatory were made in order to obtain additional observations of the self-focusing effect which are then related to the existing theories. It is shown that the periodic deep fading of the plasma line and ion line incoherent scatter radar echoes are due to a self-focusing instability. This conclusion is based on the in situ observation of electron density fluctuations with peak-to-peak amplitudes reaching at least 3% and a spatial dependence that corresponded closely to the radar fading patterns, at least for irregularity wavelengths ranging from a few hundred meters to a few kilometers. It is suggested that the radar fading is associated with the convection of the density irregularities through the radar beam. The present data are quantitatively compared with existing theories of the self-focusing instability using values for the important parameters of the ambient ionosphere obtained by the radar and satellite observations.

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