Abstract:

The S_q^p equivalent current system of the quiet day geomagnetic variation in the polar region is very complicated. It is composed of several currents, such as the ionospheric dynamo current and the auroral electrojet caused by the field-aligned current. S_q^p is unsymmetrical in both polar regions. In this paper, the S_q^p current systems are analyzed in the corrected geomagnetic coordinates (CGM) instead of the conventional geomagnetic coordinates (GM), and the symmetries of the S_q^p current in different systems are compared. Then the causes of S_q^p asymmetry in the GM coordinates are discussed; the effects of each component in S_q^p are determined.

Key words: S_q^p equivalent current systems, corrected geomagnetic coordinates, solar quiet day variation