Diurnal, seasonal and latitudinal variation of electron density in the topside F-region of the Indian zone ionosphere at solar minimum and comparison with the IRI

Details Diurnal, seasonal and latitudinal variation of electron density in the topside F-region of the Indian zone ionosphere at solar minimum and comparison with the IRI Diurnal, seasonal and latitudinal variation of electron density in the topside F-region of the Indian zone ionosphere at solar minimum and comparison with the IRI

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..359b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 3, p. 359-368.

Physics

6

Scientific paper

The diurnal, seasonal and latitudinal variation of electron density (Ne) measured by the Indian SROSS C2 satellite from December 1994 to January 1997 at low and equatorial latitudes along /75°E meridian are investigated. The satellite covered the latitude belt of /31°S to /34°N and longitude range of /40°E to /100°E at an average altitude of ~500km. Electron density is minimum before sunrise and reaches the diurnal maximum in the afternoon hours. A secondary enhancement is observed in the sunset hours of June solstice. The well-known equatorial ionization anomaly is found to be asymmetric at the altitude tracked by the satellite in this period of low solar activity (mean sunspot /number=13.9). The location of the crest of the anomaly varies with season. There are seasonal and latitudinal variations of Ne. Further, electron density is found to be positively correlated with the strength of the equatorial electrojet. Comparison of measured density with that predicted by the International Reference Ionosphere (IRI) reveals that the IRI overestimates Ne at about all local times and in all seasons. The IRI also fails to produce the secondary enhancement of electron density.

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