Aurora Borealis

Physics

Scientific paper

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Scientific paper

AT 10.55 p.m. last night, I observed a very beautiful aurora borealis, consisting mainly of three beams, nearly vertical, and then parallel to the direction of the stars α and δ of the Great Bear. They moved slowly towards the east, and about 11.5 faded away. About 11 o'clock they were very brilliant, and the central beam, then quite close to the Polar star presented a slightly purple or violet colour, as represented in the sketch inclosed. Near the earth, and at about 15° to 20° elevation, there was a mass or cloud of suffused light, from which the beams seemed to rise. It seems that an aurora was also seen about a fortnight ago from Dublin. The wind has been easterly, and to-day is somewhat colder than yesterday.

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