Abstract
A FEW remarks seem expedient on Dr. Deslandres' letter in NATURE of October 30. Various recurrence phenomena, including pulsations with periods of a few seconds or minutes, have attracted the attention of magneticians, but my original letter referred only to the recurrence of magnetic storms, that is, large disturbances of considerable duration experienced simultaneously all over the earth. The various members of a recurring series of storms do not seem to bear any special family resemblance to one another. The methods I have employed have demonstrated recurrence after intervals of 27 days or multiples thereof, but not in shorter intervals. I am uncertain whether Dr. Deslandres agrees that these large prolonged disturbances show only the 27-day interval T, or whether he believes that they also tend to recur to a lesser extent in intervals iT/6, where i is integral, and that the failure to show these shorter intervals is the fault either of my data or of my methods. He refers to doubts entertained respecting the international character figures. So far as I am aware, the only criticism passed on these is that any particular character figure, for example, 1.5, is not an absolute measure of disturbance, but may signify different amounts of disturbance in quiet and disturbed years. This criticism is one I have made myself, but the defect does not prejudice the use of the figures for discriminating between disturbance on consecutive days, the only purpose for which the figures have been used in the present connexion.
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CHREE, C. The Recurrence of Magnetic Storms. Nature 118, 769 (1926). https://doi.org/10.1038/118769a0
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DOI: https://doi.org/10.1038/118769a0
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