最后是日冕物质抛射，或是CME，一阵雨携带带电粒子云可在几天内到达地球大气。
Finally comes a coronal mass ejection, or CME, a slower moving cloud of charged particles that can take several days to reach Earth's atmosphere.
这些带电粒子形成的粒子云（又叫太阳风）在14和15日掠过地球磁场，造就了观察北极光的美妙时刻。
The southern part of the particle cloud, or solar wind, grazed Earth's magnetic field on the 14th and 15th, resulting in a particularly good night for aurorae.
研究人员认为一旦旋风、水和冰将带电微粒彼此分开，风暴即进入充电状态，产生被极度充电的云区。
Researchers believe storms become electrically charged when swirling wind, water and ice separate charged particles from one another, creating regions of cloud that are strongly charged.
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