Physics
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26.1179k&link_type=abstract
Planetary and Space Science, vol. 26, Dec. 1978, p. 1179-1184. Research supported by the British Science Council; Deutsche Forsc
Physics
Esro 1 Satellite, Esro 4 Satellite, Ionospheric Electron Density, Midlatitude Atmosphere, Satellite Observation, Time Dependence, Universal Time, Annual Variations, Atmospheric Models, Solar Activity Effects, Southern Hemisphere, Upper Ionosphere, Vertical Distribution
Scientific paper
The electron density observations made using ESRO-1 and ESRO-4 near solar maximum and solar minimum, respectively, show a strong longitudinal variation at middle latitudes in the Southern Hemisphere. The peak of this sinusoidal variation occurs at around 7 hr U.T. and decreases exponentially in size from about 300 km (depending on local time, season, solar flux) with increasing or decreasing altitude. During local summer conditions the amplitude is larger than during local winter conditions and particularly high values occur near the solar maximum. Selecting data from magnetically quiet periods, a quantitative model is constructed of the U.T.-effect in the topside electron densities.
Koehnlein W.
Raitt William J.
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