Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..277a&link_type=abstract
Geophysical Research Letters, vol. 8, Mar. 1981, p. 277-280. Research supported by the U.S. Defense Nuclear Agency;
Physics
11
Ionospheric Disturbances, Polar Regions, Scintillation, Solar Terrestrial Interactions, Ultrahigh Frequencies, Annual Variations, Diurnal Variations, Polar Caps, Solar Activity, Sunspot Cycle
Scientific paper
Amplitude scintillation measurements with a 250 MHz satellite beacon are discussed that aim to assess the diurnal, seasonal, geomagnetic and solar relationships of polar cap ionospheric irregularities. The diurnal activity shows a weak variation in any season and is apparent only during the winter months. Magnetic activity also has little effect on the scintillation index (which indicates the level of irregularity). Seasonal data, however, show very high intensity levels during the winter and lower levels during the summer sunlit months; this variation may be related to E layer conductivity changes caused by the presence or absence of sunlight at about 100 km. Years of high solar flux, as well as discrete sun aligned F layer auroras, are also associated with high scintillation levels; the variation of scintillation due to solar flux levels may be related to a corresponding solar cycle variation in polar cap F layer electron density. Spaced receiver measurements show that the drift of the irregularities, which produce a background level of weak to moderate scintillation, was antisunward.
Aarons Jules
Johnson Albert L.
Mullen J. P.
Weber Edmund J.
Whitney Herbert E.
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