A Study Of The Equatorial Ionization Anomaly From Champ Satellite Ion Density Data

The equatorial ionization anomaly and equatorial electrojet are typical plasma dynamicrnprocesses of the equatorial ionosphere. Equatorial ionization anomaly is characterizedrnas the occurrence of a trough in the ionization concentration at the equatorrnand crests from about ±150 to ±200 in magnetic latitude in each hemisphere. Equatorialrnelectrojet, on the other hand, is an intense electric current flowing in the Ernregion of the ionosphere during the day time to the east direction.rnThe aim of this thesis is to study the seasonal, longitudinal, latitudinal and earlyrnevening characteristics of the equatorial ionization anomaly. In addition, we haverndrawn a tentative relationship between the equatorial ionization anomaly and equatorialrnelectrojet. To accomplish these purposes, we have analyzed seven years (2000-rn2006) of CHAMP Satellite’s ion density and magnetometer (current profiles) data.rnThe results obtained show that the equatorial ionization anomaly varies rapidly withrnlatitude as well as with longitude. It also exhibits a day to day and seasonal variation.rnThe early evening anomaly structures are quite different from the noon times.rnIn addition, both equatorial ionization anomaly and equatorial electrojet depend onrnthe solar activity and a strong relationship exists between the two phenomena

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