Abstract
THE aurora of October 18 was observed at Allegheny Observatory under conditions somewhat similar to those mentioned by Mr. Ernest Baty in NATURE of October 28 (vol. lxxxi., p. 518). Here, however, the whole sky was dull, hazy, and cloudy at the beginning of the display, gradually clearing toward midnight. No stars whatever could be seen in the region covered by the aurora, which was very bright. This fact might lead us to think that it had its origin in the lower layers of the atmosphere.
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JORDAN, F. The Auroral Display of October 18. Nature 82, 98 (1909). https://doi.org/10.1038/082098d0
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DOI: https://doi.org/10.1038/082098d0
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