Extreme solar-terrestrial events
Extreme solar-terrestrial events
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极端日地事件
DOI：
10.1017/s1743921317004185
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
W. Gonzalez
中科院分区：
文献类型：
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作者：
A. Lago;L. Vieira;E. Echer;L. Balmaceda;M. Rockenbach;W. Gonzalez
摘要极端日地事件是指能量极大的太阳抛射撞击地球S磁层，引起地球S环流的强烈能量的事件。据统计，它们大约每Gleissberg太阳周期(70-100年)发生一次。发生在2012年7月23日的太阳瞬变可能就是这样的极端事件之一。然而，相关的日冕物质抛射(CME)并没有向地球抛射。相反，它撞上了距离日地线120度的立体声A宇宙飞船。对这种CME的地质有效性的估计指向了极端空间天气条件的情景。在环流能量方面，根据扰动风暴时间指数(DST)的测量，如果这次CME击中地球，它将引起太空时代最强的地磁风暴。
Abstract Extreme solar-terrestrial events are those in which very energetic solar ejections hit the earth?s magnetosphere, causing intense energization of the earth?s ring current. Statistically, their occurrence is approximately once per Gleissberg solar cycle (70-100yrs). The solar transient occurred on July, 23rd (2012) was potentially one of such extreme events. The associated coronal mass ejection (CME), however, was not ejected towards the earth. Instead, it hit the STEREO A spacecraft, located 120 degrees away from the Sun-Earth line. Estimates of the geoeffectiveness of such a CME point to a scenario of extreme Space Weather conditions. In terms of the ring current energization, as measured by the Disturbance Storm-Time index (Dst), had this CME hit the Earth, it would have caused the strongest geomagnetic storm in space era.