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arXiv 1010.4150physics.space-phphysics.geo-ph
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2010年4月5-7日触发长时间地磁暴的快速ICME侧翼的STEREO和风观测

STEREO and Wind observations of a fast ICME flank triggering a prolonged geomagnetic storm on 5-7 April 2010

Christian Möstl, Manuela Temmer, Tanja Rollett, Charles J. Farrugia, Ying Liu, Astrid M. Veronig, M. Leitner, Antoinette B. Galvin, Helfried K. Biernat

摘要:

2010年4月5日,风号探测器在地球前方探测到一个行星际激波,随后是一个快速(平均速率650公里/秒)的行星际日冕物质抛射(ICME)。在随后的中等磁暴期间(最小Dst = -72 nT,最大Kp=8-),与银河15号卫星的通信中断。我们将STEREO/SECCHI的图像与近地原位观测相联系,并表明ICME在太阳和地球之间没有减速。ICME侧翼导致了一个长时间的风暴增长阶段。这是第一次用立体声日光层成像仪直接观测到这种掠射碰撞。ICME内部的磁云(MC)不能用假设不变方向的方法建模。这些观测结果证实了以下假设:被归类为(1)长持续时间MCs或(2)磁云状(MCL)结构的ICME部分可能是航天器轨道通过ICME侧翼的结果。

英文摘要:

On 5 April 2010 an interplanetary (IP) shock was detected by the Wind spacecraft ahead of Earth, followed by a fast (average speed 650 km/s) IP coronal mass ejection (ICME). During the subsequent moderate geomagnetic storm (minimum Dst = -72 nT, maximum Kp=8-), communication with the Galaxy 15 satellite was lost. We link images from STEREO/SECCHI to the near-Earth in situ observations and show that the ICME did not decelerate much between Sun and Earth. The ICME flank was responsible for a long storm growth phase. This type of glancing collision was for the first time directly observed with the STEREO Heliospheric Imagers. The magnetic cloud (MC) inside the ICME cannot be modeled with approaches assuming an invariant direction. These observations confirm the hypotheses that parts of ICMEs classified as (1) long-duration MCs or (2) magnetic-cloud-like (MCL) structures can be a consequence of a spacecraft trajectory through the ICME flank.

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