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首页> 外文期刊>Geophysical Research Letters >Interplanetary shocks unconnected with earthbound coronal mass ejections - art. no. L14106
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Interplanetary shocks unconnected with earthbound coronal mass ejections - art. no. L14106

机译：与地球冠冕物质抛射无关的行星际冲击-艺术。没有。 L14106

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摘要

An associated study by Howard and Tappin (2005) identified 7 Earthbound forward shocks (of which 3 were geoeffective) which were not connected with any detectable coronal mass ejection activity along the Sun-Earth line. This largely unexplored result lends evidence to the fact that some large interplanetary transients are not detected by coronagraphs. This letter explores two possibilities for the formation of the interplanetary foreward shock, namely Corotating Interaction Regions (CIR) or Erupting Magnetic Structures (EMS). Data from EPAM, SWEPAM and MAG on board ACE provided details of the interplanetary shock and associated energetic ions along the Sun-Earth line, while evidence of magnetic field reorientation at the Sun was investigated using EIT on board SOHO, the GOES network and ground-based H alpha and radio telescopes. No evidence was found to associate 6 of the shocks with CIRs, although we were uncertain about one event, and in each case evidence of chromospheric activity at the Sun was detected between the estimated onset time of the transient and the arrival of the shock at ACE. The nature of this surface activity included X-Ray (>= C5.0) and Ha flares, associated Type III and Type II radio bursts and disappearing filaments. These results lead to the proposal that EMS are the likely source of some interplanetary transients.
机译：Howard和Tappin（2005）进行的一项相关研究确定了7次地球前向电击（其中3个对地球有效）与沿日地线的任何可探测的日冕物质抛射活动无关。这一很大程度上未经探索的结果为以下事实提供了证据：日冕仪无法检测到一些较大的行星际瞬变。这封信探讨了形成行星际前向冲击的两种可能性，即同向相互作用区域（CIR）或爆发磁性结构（EMS）。来自ACE板上的EPAM，SWEPAM和MAG的数据提供了沿太阳-地球线的行星际震动和相关高能离子的详细信息，同时使用SOHO板上的EIT，GOES网络和地面对太阳磁场重新定向的证据进行了研究。基于H alpha和射电望远镜。尽管我们不确定一个事件的发生，但没有证据将6次电击与CIR相关联，并且在每种情况下，在估计的瞬态开始时间和电击到达ACE之间都检测到了太阳在色球活动的证据。 。这种表面活性的性质包括X射线（> = C5.0）和Ha耀斑，相关的III型和II型无线电爆发和消失的细丝。这些结果导致提出这样的建议，即EMS是某些行星际瞬变的可能来源。

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