(ˌmaɪkrəʊpʌlˈseɪʃən) n (General Physics) a very minor fluctuation in the strength of the earth's magnetic field
micropulsation
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.