Abstract
IT has been known for a long time that the main emission of low latitude aurorae is that of atomic oxygen at 6300 A, so that low latitude aurorae are always red1. Some years ago Barbier2 and Roach and Roach3 reported low latitude arcs in emission at 6300 A during intense geomagnetic storms, and called them M-arcs. This paper demonstrates that the M-arc is simply an extreme manifestation of the low latitude aurora during the more intense magnetic storms, because the red oxygen emission (6300 A) develops a more pronounced peak in latitude with increasing magnetic disturbance (Dst).
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