The Aurora

Physics

Scientific paper

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Scientific paper

ALREADY we have for the height of the ``auroral beam'' the varying estimates of 44, 170, 200, and 212 miles, and assuming the correctness of any one of the three last figures, we seem drifting from the improbable to the impossible, for are we not told by Messrs. De la Rue and Müller (NATURE, vol. xxii. p. 24) that while at 81.47 miles' height, the discharge is ``pale and faint, at 124.15'' no discharge could pass? Lest this addition to the aurora's mysteries be for want of definite particulars in the observations, I add mine as nearly as I can-Time 6h. G.M.T. and a few minutes? Altitude of moon above horizon 28°. Distance from moon's centre to centre of beam as it floated above 2°, direction east to west (nearly). Lat. 51° 13' 46'' N., Long. 0° 28' 47'' W. (observatory).

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