Aurora

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Scientific paper

ABOUT 11.15 p.m. July 27, 1886, I observed an incipient stage of the aurora borealis, and about 0.10 a.m. of the 28th a considerable display of auroral colour commenced; but between 0.30 a.m. and I there was a vivid display of huge auroral sheets and columns; indeed, it did not require much to entitle the golden scene to the epithet-magnificent. There was a prismatic arc, not unlike a rainbow, which spanned from the northwest to the east, and measured about 70° from its centre to the horizon. All under this arc was a flood of white light, which the aurora did not in the least degree invade. From this arc developed a brilliant aurora borealis to a few degrees south of the zenith; and, with other constellations, Cygnus, Lyra, and the Northern Crown were overwhelmed in a golden flood. In this part of our northern latitude there are at present highly favourable conditions for phenomenal refraction of solar light. On the morning of the 27th and 28th the earth-shine on the moon was very bright, and I have no doubt but that these atmospheric conditions are also favourable to auroral displays. Every vestige of the aurora borealis disappeared about 2.30.

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