micropulsation

noun
mi·​cro·​pul·​sa·​tion | \-ˌpəl-ˈsā-shən \

Definition of micropulsation 

: a pulsation having a short period a micropulsation of the earth's magnetic field with a period in the range from a fraction of a second to several hundred seconds

First Known Use of micropulsation

1949, in the meaning defined above

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The first known use of micropulsation was in 1949

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