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Fig. 4


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Top: All-sky image for an East–West synthetic aurora spanning the sky at 45° elevation Northward. The red curve shows the pointing direction of the instrument along a 45° almucantar. The radiance of the aurora (in yellow) is 100 nW/m2/sr, against 10 nW/m2/sr for the background. Bottom: Almucantar under a synthetic aurora. Comparison using different albedo curves from Figure 3. In black: no albedo. Other colors match the profiles shown in Figure 3. Azimuths are indicated with respect to the Northern direction, positive eastward.

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