Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..579h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, June 1986, p. 579-583. Sponsorship: National Science C
Physics
3
Atmospheric Ionization, Equatorial Atmosphere, Equatorial Electrojet, F 2 Region, Troughs, Alouette Satellites, Annual Variations, Diurnal Variations, Ionospheric Ion Density, Longitude, Magnetic Equator, Neutral Atmospheres, Solar Terrestrial Interactions, Solstices
Scientific paper
Data on f(0)F2 from the satellites Alouette and ISS-b are used to study the diurnal, seasonal and longitudinal variations of the location of the equatorial trough. The trough is located at about 40-100 km to the north of the magnetic equator, which can be explained by the systematic deviation of the equatorial electrojet towards the northern hemisphere. The trough is situated to the north of the mean trough during daytime and at the June solstice, while it is to the south by night and at the December solstice. These features are consistent with the neutral wind system inherent in different local hours and different seasons. There is also a marked declination effect of the trough location which is related to the subtropical crests of f(0)F2, and may also be related to the zonal wind as a secondary effect.
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