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Coronal mass ejections, interplanetary ejecta and geomagnetic storms

机译:日冕物质抛射,行星际抛射和地磁风暴

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Studies using SOHO spacecraft data have demonstrated that frontside halo coronal mass ejections (CMEs) detected by the LASCO coronagraphs generally precede geomagnetic storms. Nonetheless, about three quarters of such CMEs do not result in even moderate geomagnetic activity. We study the relationship of all the ejecta (interplanetary CMEs) which passed Earth during 1996-1999 to coronagraph CMEs and geomagnetic activity. We reach the following conclusions: (1) Only about half of frontside halo CMEs encounter the Earth; (2) The geoeffectiveness of ejecta depends strongly on the southward magnetic field strength and, for the same southward field, is irrespective of whether or not the ejecta has a magnetic cloud structure; (3) Transit speeds of ejecta to Earth are only loosely correlated with CME speeds, one influence being the prevailing solar wind conditions between the Sun and Earth; (4) Ejecta may be detected at Earth even when there is no preceding halo CME observed by LASCO. Such ejecta are not particularly geoeffective. [References: 13]
机译:使用SOHO航天器数据的研究表明,由LASCO日冕仪检测到的正面晕冠冕物质抛射(CME)通常先于地磁风暴。但是,大约四分之三的此类CME不会导致中等程度的地磁活动。我们研究了1996-1999年间通过地球的所有射流(行星际CME)与日冕CME和地磁活动的关系。我们得出以下结论:(1)仅约一半的正面光晕CME遇到地球; (2)射出物的地球有效性在很大程度上取决于南磁场强度,对于相同的南射场,与射出物是否具有磁云结构无关。 (3)射流到地球的传播速度与CME速度之间的关系不大,其中一个影响是太阳与地球之间普遍存在的太阳风条件。 (4)即使LASCO未观察到先前的CME,也可能在地球上检测到喷射物。这样的喷射器不是特别有效的。 [参考:13]

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