Polar solar daily geomagnetic variations on exceptionally quiet days

The analysis of magnetic records from the polar regions on two exceptionally quiet days (May 8, 1964, Kp = 0o0o0+0o 0o0+0+0+, ΣKp = 1+; December 10, 1963; Kp = 0o0o0+0o 0o0o0o0o, ΣKp = 0+) confirms the conclusion reached by Hasegawa and Nagata and Kokubun that the polar Sq variation consists of two parts, Sqo and Sqp. However, the distribution of the Sqp field obtained in the present analysis differs significantly from that obtained by the earlier workers in that there is a lack of significant change in the midnight sector. This result may be contrasted with the field caused by the polar electrojet, which is strongest in the midnight sector.