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http://dx.doi.org/10.5140/JASS.2013.30.1.043

Dependence of Quiet Time Geomagnetic Activity Seasonal Variation on the Solar Magnetic Polarity  

Oh, Suyeon (Department of Astronomy and Space Science, Chungnam National University)
Publication Information
Journal of Astronomy and Space Sciences / v.30, no.1, 2013 , pp. 43-48 More about this Journal
Abstract
The geomagnetic activity shows the semiannual variation stronger in vernal and autumnal equinoxes than in summer and winter solstices. The semiannual variation has been explained by three main hypotheses such as Axial hypothesis, Equinoctial hypothesis, and Russell-McPherron Effect. Many studies using the various geomagnetic indices have done to support three main hypotheses. In recent, Oh & Yi (2011) examined the solar magnetic polarity dependency of the geomagnetic storm occurrence defined by Dst index. They reported that there is no dependency of the semiannual variation on the sign of the solar polar fields. This study examines the solar magnetic polarity dependency of quiet time geomagnetic activity. Using Dxt index (Karinen & Mursula 2005) and Dcx index (Mursula & Karinen 2005) which are recently suggested, in addition to Dst index, we analyze the data of three-year at each solar minimum for eight solar cycles since 1932. As a result, the geomagnetic activity is stronger in the period that the solar magnetic polarity is anti-parallel with the Earth's magnetic polarity. There exists the difference between vernal and autumnal equinoxes regarding the solar magnetic polarity dependency. However, the difference is not statistically significant. Thus, we conclude that there is no solar magnetic polarity dependency of the semiannual variation for quiet time geomagnetic activity.
Keywords
geomagnetic activity; semiannual variation; Russell-McPherron effect; solar magnetic polarity dependency; Dst index;
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Times Cited By KSCI : 2  (Citation Analysis)
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