Abstract
Observations are reported on the oxygen emissions at \\ ̄ gl6300 Å and \\ ̄ gl5577 Å at Macquarie Island ( L lat. 64.2°S). In the absence of discrete aurora, a significant North-South gradient of red line intensity was present at all times. The intensity had a positive magnetic dependence and the isophotes were aligned with parallels of geomagnetic L latitude. The green line emission had essentially a flat latitudinal distribution. The results are discussed in relation to the findings of Sandford (1964, 1968). The red line emission, suggested as arising from thermal electron excitation in the F-region, to which heat is conducted from the magnetosphere, is briefly discussed in relation to the mid-latitude SAR-arc phenomenon.
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