Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..600k&link_type=abstract
Planetary and Space Science, vol. 25, June 1977, p. 600-602. Deutsche Forschungsgemeinschaft
Physics
8
Esro 4 Satellite, Ionospheric Electron Density, Midlatitude Atmosphere, Satellite Observation, Upper Ionosphere, Electron Density Profiles, Magnetic Effects, Northern Hemisphere, Polar Orbits, Southern Hemisphere, Temperate Regions
Scientific paper
The position of the midlatitude trough in the topside ionosphere is determined from electron-density data of ESRO 4 during quiet solar conditions. An analysis of about 300 trough observations in the Northern and Southern Hemispheres showed that the trough was generally seen only during the night from 19 to 05 hr LT. During this period, the invariant latitude of the minimum of the trough was found to decrease both with increasing geomagnetic disturbance presented by Kp and with increasing LT after sunset.
Koehnlein W.
Raitt William J.
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