Abstract
GEOMAGNETIC storms fall into two distinct categories: recurrent and sporadic. Recurrent storms are produced by continuous streams of particles issuing from the solar M-regions. Swept round by the rotating Sun, the corpuscular streams overtake the Earth in its orbit at monthly intervals. By contrast, a sporadic magnetic storm marks the arrival of a single cloud of plasma, ejected at the time of a solar flare.
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SAEMUNDSSON, T. Origin of Sudden Commencements. Nature 194, 1268 (1962). https://doi.org/10.1038/1941268a0
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DOI: https://doi.org/10.1038/1941268a0
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