Abstract
THE observations described in your last number as having been made long since in Siberia, of lunar halos projected on auroras, have not, I believe, been confirmed by other observers; but if correct, possibly this phenomenon may be a peculiarity of auroras in Siberia, or in the Arctic regions. There seems reason to think (see Capron's “Auroræ,” pp. 37–40) that auroras may be lower when near the magnetic pole than further south. If this is the case, it is so far favourable to the theory (propounded, I think, by a German writer) described in NATURE (Vol. xxv. p. 320), that the auroral zone is a plane, and not part of a sphere concentric with the earth's surface. The majority of the observations in lower latitudes cited in Capron's “Auroræ,” place the phenomenon at a height of 100 miles or upwards.
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BACKHOUSE, T. The Heights of Auroras. Nature 27, 198 (1882). https://doi.org/10.1038/027198b0
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DOI: https://doi.org/10.1038/027198b0
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