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Mr. Herbert Ingall’s Aurora, July 18th, 1874.

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Mr. Herbert Ingall’s Aurora, July 18, 1874. Haze canopy formed. Bright bluish flames appeared. Beams and streamers appeared. Oscillatory motion of rays.

An Aurora of July 18th, 1874, seen by Mr. Herbert Ingall at Champion Hill, S.E., was described by him as an extraordinary one. About 11 the sky was clear; at midnight the sky was covered by a sort of haze canopy, sometimes quite obscuring the stars, and then suddenly fading away. Mr. Ingall was shortly after remarking the sky in the S.E. and S. horizon as being more luminous than usual, when his attention was drawn to a growing brightness in the S.W., and a moment afterwards bright bluish flames “swept over the S.W. and W. horizon, as if before a high wind. They were not streamers, but bright blue flames.” They lasted about a minute and faded; but about two minutes afterwards a glowing luminosity appeared in the W.S.W., and broke into brilliant beams and streamers. The extreme rays made an angle of 90° with each other, the central ray reaching an altitude of 50°. The extreme divergence of the streamers (indicating their height above the earth’s surface), and their direction (from W.S.W. to E.N.E.) at right angles to the magnetic meridian, suggested to Mr. Ingall a disturbance of an abnormal character. The rays had an oscillatory motion for about fifteen seconds, and then disappeared, “as if a shutter had suddenly obscured the source of light.”

Mr. Ingall’s remarks corroborated.

Mr. Ingall’s remarks were corroborated by an observer in lat. 54° 46´ 6″·2 N., long. 6h 12m 19s·75 W. The display, however, was more brilliant, and the intensity of light at midnight illuminated the whole district as with an electric light. The rays, too, bore tints differing from one another; the largest seemed to partake of the nature of the blue sky, while the smaller ones, running parallel with the horizon, were ever changing from blue to orange-red.

Rev. C. Gape saw flashes or streaks of a pale blue colour.

On June 25 (same year?), between 9 and 10 o’clock, the Rev. Chas. Gape saw at Rushall Vicarage, Scole, Norfolk, in the E.S.E., very frequent flashes or streaks of a pale blue colour darting from the earth towards the heavens like an Aurora. The day had been dull and close, with distant thunder. In the E.S.E. it was dark, but overhead and everywhere else it was clear and starry.

Auroræ: Their Characters and Spectra

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