Abstract
DURING the 1957 to 1958 solar activity maximum, monochromatic mid-latitude auroral arcs of 6300 A (OI) were seen for about 20% of the observation time1. The arcs observed, however, were chiefly single, and multiple arcs occurred only on very few occasions. During the present maximum solar activity year no multiple arcs were reported. In this communication we report the reappearance of the multiple arc system on the night of March 8 to 9, 1970, during the recovery phase of a geomagnetic storm which began at 0918 h EST on March 8, 1970.
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