Ionospheric heating with obliquely incident waves

Details Ionospheric heating with obliquely incident waves Ionospheric heating with obliquely incident waves

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..761f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, Nov. 1985, p. 761-763. USAF-sponsored research.

Physics

4

Incident Radiation, Ionospheric Heating, Radio Frequency Heating, Space Plasmas, Electric Fields, Electron Energy, F Region, Night Sky

Scientific paper

Nearly all ionospheric heaters operate at vertical incidence. Oblique waves cannot satisfy frequency-matching conditions necessary to excite the parametric decay instability, and they are weakened by geometric spreading below the ionosphere. Those spreading losses are mitigated, however, by focussing near caustics. This paper calculates fields near the caustics of oblique waves and estimates the corresponding increases in electron temperature. It finds that a transmitter having a power-gain product of 5 MW can raise the temperature of F-layer electrons by a hundred degrees or more. Those temperature increases are initially concentrated in narrow regions near caustics, but spread by heat conduction over tens of kilometers.

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