Development of Magnetic Bay Disturbances and Associated ｆmin Increases
Sano, Y. & Ondoh, T.
Abstract
The equivalent current systems of many individual magnetic bay disturbances and associated fmin increase (Δfmin≧3Mc/s) patterns at successive hourly stages are investigated concerning the relation of two phenomena in morphological features. Our main purpose is to examine the characteristics of time variation and spatial distribution of these two disturbances. It is confirmed that the fmin increase pattern is sensitive to the magnetic disturbance pattern, and the primary activated areas of both the disturbances are in the dawn hemisphere. It is discussed briefly whether or not the present results can be explained by some existing theoretical evidences or models.
Finally the brief statistical results on the behavior of the equatorial Dst-field during the bay disturbances and the occurrence correlation of bay disturbances between the auroral zone (College) and the low latitude zone (Honolulu) are shown. It is concluded that the morphological feature of the magnetic bay disturbance is quite similar to that of the magnetic storm.
