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此次风暴源于1月18日太阳爆发的X1.9级耀斑(太阳最强耀斑级别),并伴随日冕物质抛射(CME)——数十亿吨太阳粒子被抛射磁场束缚而喷发。CME犹如太阳的“喷嚏”,当其朝向地球时,携带的能量撞击磁层,加速捕获的带电粒子沿磁力线注入高层大气(主要在两极),与大气粒子作用形成极光。
此次CME后还跟随一个巨大冕洞:太阳表面磁场减弱开放的区域,使太阳风更易逃逸。当前太阳风速达1069.9公里/秒,接近平均速度(约400公里/秒)的三倍。高速太阳风本身可引发极光,与CME结合时效果更显著。
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辐射暴粒子(主要为质子)比CME更快抵达地球。尽管辐射暴最强烈阶段已过,但持续的太阳风或使地磁活动延续。若条件允许,不妨前往户外仰望夜空,欣赏这场极光盛宴。

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