Abstract
North-south asymmetry of geomagnetic activity with respect to the solar equatorial plane has been studied for the period 1878–1988, utilizing the seasonal change in the heliographic latitude of the Earth. It was found that the north-south asymmetry of the aa index showed a variation with a period of 11 years in the solar cycles 12–15 (1878–1923), followed by a variation with a 22 year period in the solar cycles 17–21 (1933–1988). This peculiar behavior is discussed in comparison with the variation in the north-south asymmetry of the sunspot number on the solar disc.
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