Abstract
RECORDS of geomagnetic disturbances during the seven sunspot cycles from 1884 to 1954 reveal a strong tendency for the initial disturbance of a 27-day recurrent series to occur near January or July. Final disturbances of such series show this tendency only weakly.
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References
Rush, J. H., and Trotter, Dorothy E., Astron. J., 59, 191 (1954).
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RUSH, J. A Semi-annual Periodicity in the Beginnings of Recurrent Magnetic Storm Series. Nature 175, 517–518 (1955). https://doi.org/10.1038/175517a0
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DOI: https://doi.org/10.1038/175517a0
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