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 ?
Occurrence of Sudden Commencements at the Watheroo Magnetic Observatory.
Yearly and daily period on the frequency of sudden commencements of magnetic storms.
Report to the President of the Committee on Sudden Commencements.