Memoirs of the Kakioka Magnetic Observatory Vol.15 No.01， p.19, December, 1972
Geomagnetic Solar Daily Variations at the Middle Latitude and the Day-to-day Variability of Equivalent Overhead Current System
Shiraki, M.
Abstract
During the IASY a continuous observation of geomagnetic field was carried out at Chichijima(27°06'N, 142°11'E; Geomagnetic 17.1°N). On this opportunity geomagnetic solar daily variations at the middle latitude stations in Japan were looked over again. General characteristics of the middle latitude part of the normal world-wide variation are seen in the results obtained here though some problems are still left.
Day-to-day changes of horizontal intensity and declination were also examined for quiet days on which Sq variations were derived. And a very large day-to-day variability of equivalent overhead current system is shown both in the center of focus and in the intensity.
