Traveling ionospheric disturbances detected by UHF angle-of-arrival measurements

Details Traveling ionospheric disturbances detected by UHF angle-of-arrival measurements Traveling ionospheric disturbances detected by UHF angle-of-arrival measurements

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..255e&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, April 1983, p. 255-265. Army-NSF-supported research.

Physics

4

Ionospheric Propagation, Traveling Ionospheric Disturbances, Ultrahigh Frequencies, Brunt-Vaisala Frequency, Data Processing, F Region, Gravity Waves, Radar Tracking, Transit Satellites

Scientific paper

The paper reports observations of short-wavelength (30-60 km) traveling ionospheric disturbances (TIDs) as they influenced the apparent position of a beacon satellite at 400 MHz. Signals transmitted by the Navy Navigation Series (Transit) satellites were received by the Millstone Hill 84-ft satellite tracking radar reflector, which was also employed in active tracking in the L band (1295 MHz). Short-period fluctuations in the displacement between the apparent positions of the satellite in the UHF and L bands were found in 40 percent of all satellite passes, and were identified with short-wavelength TIDs.These waves were found to induce fluctuations chiefly in elevation, being largest at lower elevations, and were equally as frequent at all local times and seasons. Simultaneous differential-Doppler data indicates no significant fluctuations of electron content along the line of sight to the satellite. It is suggested that the fluctuations are produced by tilts or corrugations in the lower ionosphere where the density gradients are largest.

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