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micropulsation
micropulsation (ˌmaɪkrəʊpʌlˈseɪʃən) n (General Physics) a very minor fluctuation in the strength of the earth's magnetic fieldmicropulsation
micropulsation[¦mī·krō·pəl′sā·shən] (geophysics) A short-period geomagnetic variation in the range of about 0.2-600 seconds, typically exhibiting an oscillatory waveform. |