The role of field-aligned ionization irregularities in the generation of the HF-induced plasma line at Arecibo

Details The role of field-aligned ionization irregularities in the generation of the HF-induced plasma line at Arecibo The role of field-aligned ionization irregularities in the generation of the HF-induced plasma line at Arecibo

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2552m&link_type=abstract

Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2552-2560.

Physics

7

Electrostatic Probes, High Frequencies, Ionospheric Electron Density, Ionospheric Heating, Ionospheric Propagation, Plasma Spectra, Airy Function, Collisional Plasmas, Plasma Waves, Wave Propagation

Scientific paper

Data from the July 1976 ionospheric modification experiments at Arecibo show that the Langmuir waves responsible for the enhanced plasma line are generated at the height in the ionosphere at which the Airy function, which describes the standing electric field of the high-frequency (HF) modifying wave near reflection, has its main maximum. Since the enhanced Langmuir waves which backscatter the 430-MHz radar signal could not exist at this height in a uniformly varying ionosphere, underdense ionization irregularities must exist in the ionosphere. The ionization irregularities responsible for the HF-enhanced plasma line are probably field aligned, and it is proposed that Langmuir waves are amplified parametrically as they propagate in the duct to where their wave normals are parallel to the radar beam. 'Broad bump' feature, background or 'immature' spectrum, and the 'overshoot' phenomenon are considered.

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