Dependence of ionospheric drift speed on geomagnetic activity

Physics – Space Physics

Scientific paper

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Drift Rate, Geomagnetism, Ionospheric Drift, Kp Index, Magnetoactivity, Tropical Regions, Correlation Coefficients, E Region, F Region

Scientific paper

Effect of geomagnetic activity on ionospheric drift speed is studied for Udaipur (geomag. lat., 14.55 N). To reduce the effect of solar activity, the study is made with the data obtained during Mar. 1974-Oct. 1975, a low activity period, and only those days for which 10.7 cm solar flux was below 90 have been considered. A negative correlation is found between noontime E region apparent drift speed and geomagnetic (Kp) index. An identical relationship is obtained for nighttime apparent drift speed with Kp in the case of the F-region. The correlation coefficients deduced in the two cases are -0.81 and -0.86, respectively.

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