Journal of geomagnetism and geoelectricity
Online ISSN : 2185-5765
Print ISSN : 0022-1392
ISSN-L : 0022-1392
Development and Decay Processes of the Bay Disturbances in Geomagnetic Field
Naoshi FUKUSHIMA
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1951 年 3 巻 3-4 号 p. 59-76

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In this study, the progressive change in the current system for the bay disturbance was chiefly examined in four examples with the aid of the world-wide magnetogram copies. The average current system corresponding to the maximum stage of the bay disturbance, which is given in Fig. 3, can be approximated as a result of the dynamo-theoretical calculation under the assumption on the distribution of the electric conductivity in the upper atmosphere such as that the ratio of the conductivity in the auroral zones to that i n the equatorial region is about 14 in the dark hemisphere and about 4 in the sunlit hemisphere. The development and decay processes of individual bay disturbances are not a simple intensification and diminution of the mean current system such as given in Fig. 3, It was noticed that the westward auroral zone current in the dark hemisphere seems to become most intense nearly at the same time when the disturbance force at most part of lower latitude regions reaches its maximum magnitude, and the eastward auroral zone current in the sunlit hemisphere does not yet fully develope by that time and becomes most intense a few tens minutes later.
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© Society of Geomagnetism and Earth, Planetary and Space Sciences
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