Morphology of ssc and ssc

抄録

In general we may consider that it is very rare that ssc is not observed in any part of the world at the time of sudden commencement of magnetic storms. The electric current-systems for the world distribution of the preliminary impulse and the main impulse of the sudden commencement vectors are derived. These current-systems will be situated in the earth's upper atmosphere except the current representing the world-wide increase in the horizontal component of geomagnetic field of extra-terrestrial origin. The dependency of occurrence freqency of ssc on local time and latitude can reasonably be explained by the characteristic modes in these current-systems. A theoretical interpretation of ssc and ssc phenomena will be possible by combining the merits of various different theories.