Abstract
IN an interesting paper in Petermann's Mittheilungen for October, Prof. Fritz gives the results of his extensive researches on this subject. The investigation is beset with difficulties, not only from the deficiency of observations, but from their irregularity. While some observers content themselves with noting only the more remarkable displays, others register the faintest light to the north as an aurora. One observer continues his observations for tens of years, while another, whose zeal has been roused during a period of maximum frequency, allows it to cool when a minimum, with its rare and feeble displays, again returns. The research is further complicated by the fact that the appearance is not only dependent on latitude, but undergoes a periodic change, which in the region of most frequent display manifests itself less in diminished number than in diminished intensity of aurora; and because in some places the phenomenon is far more frequently concealed by a cloudy sky than in others.
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P., H. The Geographical Distribution of Auroræ . Nature 11, 14–15 (1874). https://doi.org/10.1038/011014b0
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DOI: https://doi.org/10.1038/011014b0