Analysis of the Records of the Magnetic Storms observed at the Kakioka Magnetic Observatory

Abstract

The present authors have analysed the records of 30 magnetic storms of moderate intensity recorded at the Kakioka magnetic observatory, Japan, following the method uscd by S. Chapman.
The horizontal force clearly shows the initial increase of small intensity and then it decreases far greater and about 40 hours after the commencement of the storm it begins to restore the normal value. The vertical force undergoes a similar changes as that of the horizontal force inverse in direction and smaller intensity, while the declination seems to show no such a marked change.
Moreover we have calculated average diurnal variations on the calm days and the additional mean diurnal variations during the three epochs, namely the first day (6^h-30^h) after the commencement) the intermediate day (18^h-40^h) and the second day (30^h-54^h).