Simultaneous observations of the enhanced plasma line and of the reflected HF wave at Arecibo

Details Simultaneous observations of the enhanced plasma line and of the reflected HF wave at Arecibo Simultaneous observations of the enhanced plasma line and of the reflected HF wave at Arecibo

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..721f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Sept.-Oct. 1989, p. 721-725. Research supported by the

Physics

3

F Region, High Frequencies, Ionospheric Electron Density, Reflected Waves, Thermal Plasmas, Field Aligned Currents, Ionospheric Disturbances, Puerto Rico, Pulse Duration, Radar Scattering

Scientific paper

A suitably devised pulsing sequence of the powerful HF transmissions radiated toward the ionosphere below the penetration frequency made it possible to separate the attenuation of the reflected HF wave due to thermal and to ponderomotive-type parametric instabilities. The results show that previously accepted explanations of the overshoot in the 430-MHz enhanced plasma line for 5.3-MHz HF transmissions are invalid. A strong overshoot was observed but the attenuation of the powerful HF wave was too small to be observed. For 3.175-MHz HF transmissions substantial attenuation was observed.

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