Abstract
THE frequency of thunderstorms in relation to the sunspot period is discussed by Dr. Aksel S. Steen in reprint from the “Hann-Band der ineteorologischen Zeitschrift.” The author has dealt with data from Norway, Sweden, and Denmark, using material from twenty, twenty-eight, and eight stations in each country respectively, extending from the years 1873 to 1903. The result of the inquiry is to show that the curves for the frequency at each of these regions have maxima at about the times of the sun-spot maxima, and minima at about sun-spot minima, but underlying this variation one of half the period is apparent. In combining the results of all the three stations, the curve still shows the eleven-year variation with the change of shorter duration.
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Meteorological Notes . Nature 75, 67–68 (1906). https://doi.org/10.1038/075067a0
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DOI: https://doi.org/10.1038/075067a0