| 单词 | micropulsation | 
| 释义 | > as lemmasmicropulsation   micropulsation  n.  Brit. , U.S. a small oscillation in the strength of the earth's magnetic field. ΘΚΠ the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > 			[noun]		 > small oscillation micropulsation1949 1949    Proc. Japan Acad. 25  ix. 24  				A remarkable micropulsation of dH/dt at the sudden commencement [of the magnetic storm] frequently took places [sic] during the summer and equinox, while it is weak during the winter. 1978    Nature 13 July 121/2  				It is difficult to establish the exact nature of the relationship between auroral pulsations and fluctuations in the Earth's magnetic field, called micropulsations. < as lemmas | 
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