Real time TV records of aurora obtained by a highly sensitive TV camera at Syowa station in 1971 are analyzed. Motion of almost all bright auroral structures is found to have a clockwise sense of rotation (as viewed from below in the southern hemisphere), even when a seemingly counterclockwise spiral (or fold) appears along an auroral arc. This suggests that the auroral electron precipitation is closely related to the production of negative charge excess, at least for the dusk type and high-latitude type auroras.
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T. Oguti (1974) studied this question.
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