ASYMMETRY IN SEASONAL VARIATION OF GEOMAGNETIC ACTIVITY Page No: 813-820

Falayi EO and Beloff N

Keywords: Disturbance storm time (Dst), aurora electrojet (AE), seasonal variation, sunspots.

Abstract: Seasonal variations in geomagnetic activities were studied for the period of 1990-2007 using Dst and AE indices. Over 150 events characterised by increase in geomagnetic activity of varying strength (from -90 up to -1800nT) were statistically analysed. Although Russell- McPherron effect plays a major role in the equinoctial asymmetry of the geomagnetic activity, others may also take place. During this study we found a statistically significant October- November peak in geomagnetic activity for Northern Hemisphere, which is sufficiently larger than March-April peak. Several hypotheses for the cause of such effect are discussed.



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