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Coronae on April 6th, 2007

On the morning of April 6th magnificient coronae could be seen near Giessen, probably produced by high level cirrus haze. The coronae were visible for about half an hour and became fainter when thicker cirrus came up. These beautiful coronae may also have been created by large amounts of birch pollen in the air, but birch pollen coronae are especially difficult to tell from 'normal' coronae produced by droplets. The coronae were not limited to the vicinity of birches. They reappeared in the afternoon.

The horizontal field of view is about 20 degrees, which means that the particles responsible for the coronae were only about 18 microns large.


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