Abstract
Evidence is presented for the existence of discrete 5577 airglow cells in the upper atmosphere. Independent analyses are based on 1. (a) the comparison of diurnal intensity variations in different parts of the sky and 2. (b) the measurement of intensity gradients on airglow isophote maps. The numerical estimation of cell size is complicated by the fact that a single cell is, in general, larger than the region observable at a given location. The typical airglow cell for the 12 nights of the study has a diameter of approximately 2500 km.
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