Physics – Plasma Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..249k&link_type=abstract
(APS, Plasma Physics Division, Meeting, Cincinnati, OH, Nov. 12-16, 1990) Geophysical Research Letters (ISSN 0094-8276), vol. 19
Physics
Plasma Physics
2
Electrostatic Waves, High Frequencies, Ionospheric Heating, Plasma Spectra, Field Aligned Currents, Magnetohydrodynamic Stability, Resonant Frequencies
Scientific paper
Attention is given to a nonlinear scattering process analyzed as a source mechanism producing the frequency up-shifted HFPLs observed in the Arecibo ionospheric heating experiments. A physical picture is offered to explain how Langmuir waves with frequencies greater than the HF heater wave frequency can be produced in the heating experiments and be detected by incoherent radars as frequency up-shifted HFPLs. Since the considered scattering process occurs in a region near the reflection height, it explains why the frequency up-shifted HFPLs should originate from the altitude near the reflection height as observed. The theory also shows that the amount of frequency up-shift is inversely proportional to the frequency of the HF heater and increases linearly with the electron temperature. The quantitative analysis of the theory shows a good agreement with the experimental results.
Kuo Spencer P.
Lee Ming-Chang
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