0n the Seasonal Change of Geomagnetic Sq Variation
Endo, H.
Abstract
Seasonal and interdiurnal variations of the location of Sq current system are investigated with respect to its diurnal and semidiurnal parts. The diurnal current system suffers considerable day-to-day and seasonal changes of its location between 30°and 50°N lat. Iｔ shifts northward in winter and southward in summer. While the center of semidiurnal current system suffers less remarkable change of its location than the diurnal one; and locates definitely southward of it. The northward and southward shift of diurnal current system correlates to intensification and weakening of the upper westerlies respectively. The difference in the behaviours of the two current systems suggest the difference in the mechanisms which cause them.
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