sudden commencement


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sudden commencement

[′səd·ən kə′mens·mənt]
(geophysics)
Magnetic storms which start suddenly (within a few seconds) and simultaneously all over the earth.
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References in periodicals archive ?
Yearly and daily period on the frequency of sudden commencements of magnetic storms.
Report to the President of the Committee on Sudden Commencements. Transactions of the Edinburg Meeting, [Sept.17-24, 1936].