Aurora at Christiania

Physics

Scientific paper

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Scientific paper

ON the evening of March 15 an aurora appeared of unusual proportions for our part of the country. It was seen for the first time at 7.45, and then consisted of diffused and faint arches high on the northern sky. By degrees its sphere extended, and at 8.30 it reached the zenith. In this position-from the northern horizon to zenith-the phenomenon remained almost uninterrupted all the following time. The light was rather feeble, and in the beginning the motions were insignificant. But at 10 o'clock the peculiar blazing or undulating movement that is designated by the name of coruscation, began to be seen, and during four hours and a half at least the whole northern half of the sky was the theatre of this uncommonly violent chase of the luminous clouds. The culmination of the aurora happened at 10.30, when on the northern sky advanced a series of splendid streamers, the inferior points of which played in red and green. This radiance was only of short duration, and later there appeared in the north only arches more or less distinct; while on the higher parts of the heavens the chasing flames incessantly continued their playing. Still, so late as 14.30 saw the flames as far as to the zenith with unimpaired violence.

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