首页> 外文期刊>The Astrophysical Journal. Letters >SUN-TO-EARTH CHARACTERISTICS OF TWO CORONAL MASS EJECTIONS INTERACTING NEAR 1AU: FORMATION OF A COMPLEX EJECTA AND GENERATION OF A TWO-STEP GEOMAGNETIC STORM
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SUN-TO-EARTH CHARACTERISTICS OF TWO CORONAL MASS EJECTIONS INTERACTING NEAR 1AU: FORMATION OF A COMPLEX EJECTA AND GENERATION OF A TWO-STEP GEOMAGNETIC STORM

机译:相互作用在1au附近的两个冠状质量喷出的日地特征:复杂射电的形成和两级地磁风暴的产生

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摘要

On 2012 September 30-October 1 the Earth underwent a two-step geomagnetic storm. We examine the Sun-to-Earth characteristics of the coronal mass ejections (CMEs) responsible for the geomagnetic storm with combined heliospheric imaging and in situ observations. The first CME, which occurred on 2012 September 25, is a slow event and shows an acceleration followed by a nearly invariant speed in the whole Sun-Earth space. The second event, launched from the Sun on 2012 September 27, exhibits a quick acceleration, then a rapid deceleration, and finally a nearly constant speed, a typical Sun-to-Earth propagation profile for fast CMEs. These two CMEs interacted near 1 AU as predicted by the heliospheric imaging observations and formed a complex ejecta observed at Wind, with a shock inside that enhanced the pre-existing southward magnetic field. Reconstruction of the complex ejecta with the in situ data indicates an overall left-handed flux-rope-like configuration with an embedded concave-outward shock front, a maximum magnetic field strength deviating from the flux rope axis, and convex-outward field lines ahead of the shock. While the reconstruction results are consistent with the picture of CME-CME interactions, a magnetic cloud-like structure without clear signs of CME interactions is anticipated when the merging process is finished.
机译:2012年9月30日至10月1日,地球经历了两步地磁风暴。我们结合日球层成像和原位观测资料,研究了引起地磁风暴的日冕物质抛射(CME)的日对地特征。第一次CME发生在2012年9月25日,是一个缓慢的事件,在整个太阳地球空间中显示出加速,然后几乎保持不变的速度。第二个事件于2012年9月27日从太阳启动,表现出快速加速,然后快速减速,最后接近恒定的速度,这是用于快速CME的典型的太阳到地球传播曲线。这两个CME相互作用,如日球成像观察所预测的那样,在1 AU附近相互作用,并形成了在风中观察到的复杂喷射,其内部的震动增强了先前存在的向南磁场。用原位数据重建复杂的射流,表明整体呈左手状的磁通绳状构型,具有嵌入式的凹向外激波前部,最大磁场强度偏离磁通量绳轴,并且前方有凸向外磁场线的震惊。虽然重建结果与CME-CME交互作用的图片一致,但是当合并过程完成时,预计会出现没有清晰CME交互作用迹象的类云状结构。

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