HF produced ionospheric electron density irregularities diagnosed by UHF radio star scintillations

Details HF produced ionospheric electron density irregularities diagnosed by UHF radio star scintillations HF produced ionospheric electron density irregularities diagnosed by UHF radio star scintillations

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44.1101f&link_type=abstract

(International Union of Radio Science, General Assembly on Ionospheric Modification, 20th, Washington, DC, Aug. 10-19, 1981.) Jo

Physics

7

F Region, High Frequencies, Ionospheric Electron Density, Radio Stars, Scintillation, Ultrahigh Frequencies, Geomagnetism, Ionospheric Heating, Magnetic Fields, Plasma-Electromagnetic Interaction, Power Spectra, Radiant Flux Density, Screen Effect

Scientific paper

Three observations of radio star intensity fluctuations at UHF are reported for HF ionospheric modification experiments carried out at the Arecibo Observatory. Two observations at 430 MHz and one at 1400 MHz suggest that the the thin phase screen theory is a good approximation to the observed power spectra. It is noted, however, that the theory has to be extended to include antenna filtering. This type of filtering is important for UHF radio star scintillations since the antenna usually has a narrow beamwidth. HF power densities of less than 37 microwatts/sq m incident on the ionosphere give rise to electron density irregularities larger than 13% of the ambient density (at 260 km) having scale sizes of approximately 510 m perpendicular to the geomagnetic field. The irregularities are found to form within 20-25 s after the HF power is turned on. The drift velocities of the irregularities can be estimated from the observed power spectra.

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