Abstract
Observations of Stable Auroral Red arcs from Adelaide ( L lat. 45.3°S) on four occasions in the period September, 1967 to October, 1969 are reported. A noted feature was the low intensity of λ6300 Å emission from the arcs, with values ranging from 300 R down to 50 R. On two occasions, small components of A5577 Å emission were detected in the region of the arc and an explanation is offered in terms of the dissociative recombination of O 2 +. Occurrences of oblique ionogram echoes at Christchurch, New Zealand, during optical observation of arcs at Adelaide are also reported. Some evidence for local time control of arc alignment and latitudinal movement is presented. Methods of height determination are discussed.
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