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首页> 外文会议>Cluster and double star symposium >SUBSTORM TOPOLOGY IN THE IONOSPHERE AND MAGNETOSPHEREDURING A FLUX ROPE EVENT IN THE MAGNETOTAIL
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SUBSTORM TOPOLOGY IN THE IONOSPHERE AND MAGNETOSPHEREDURING A FLUX ROPE EVENT IN THE MAGNETOTAIL

机译：电离层中的基层拓扑和磁化层在磁极中的磁通跳动事件

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On August 13, 2002, at ～ 2300 UT, about 10 min after a substorm intensification, Cluster observes a flux rope in the central magnetotail, followed by a localised fast flow event about one minute later. Associated with the flux rope event, a traveling compression region (TCR) is seen by those Cluster spacecraft which reside in the lobe. In the conjugate ionospheric region in Northern Scandinavia, the MIRACLE network observes the ionospheric equivalent currents, and the electron densities and electric fields are measured by the EISCAT radar along a meridional scanning profile. Further, the auroral evolution is observed with the Wideband Imaging Camera (WIC) on the IMAGE satellite. We compare in detail the substorm evolution as observed in the ionosphere and in the magnetosphere, and examine whether topological correspondences to the flux rope event exist in the ionospheric signatures. The large-scale mapping of both the location and the direction of the flux rope to the ionosphere shows an excellent correspondence to a lens-shaped region of an auroral emission minimum. This region is bracketed by an auroral region equatorward of it which was pre-existing to the substorm intensification, and a substorm-related auroral region poleward of it. It is characterised by reduced ionospheric conductances with respect to its environment, and downward field-aligned current (FAC) observed both in the magnetosphere and in the ionosphere. As determined from the ionospheric data, this downward FAC area is moving eastward with a speed of ～ 2 km s-1, in good agreement with the mapped plasma bulk velocity measured at the Cluster satellite closest to that area. Further southwestward to this leading downward FAC area, a trailing upward FAC area is observed that moves eastward with the same speed. The direction of the ionospheric electric field permits a current closure between these two FAC areas through the ionosphere. We speculate that these FAC areas may correspond to the ends of the flux rope in its symmetry direction.
机译：2002年8月13日，在大约2300 UT，在亚暴风暴强化后约10分钟，Cluster观察到中心磁尾中有一条通量绳，随后约一分钟后发生了局部快速流动事件。与通量绳事件相关联，驻留在波瓣处的那些集束航天器会看到行进压缩区域（TCR）。在斯堪的纳维亚半岛北部的共轭电离层区域，MIRACLE网络观测到电离层的等效电流，并且电子密度和电场由EISCAT雷达沿子午扫描剖面进行测量。此外，通过IMAGE卫星上的宽带成像摄像机（WIC）可以观察到极光的演变。我们详细比较了在电离层和磁层中观测到的亚暴演变，并检查了电离层特征中是否存在与通量绳事件的拓扑对应。通量绳到电离层的位置和方向的大规模映射显示出与极光发射最小值的透镜形区域的极佳对应关系。该区域被一个先于亚风暴加剧的极光区域赤道包围，而与之相关的与亚风暴有关的极光区域则处于极赤道。它的特点是相对于其环境的电离层电导降低，并且在磁层和电离层中均观测到向下的场取向电流（FAC）。根据电离层数据确定，该向下的FAC区域以〜2 km s-1的速度向东移动，这与在距离该区域最近的簇状卫星上测得的测绘血浆体积速度非常吻合。进一步向西南延伸至该下行FAC领先区域，观察到一个上行的FAC尾随区域以相同的速度向东移动。电离层电场的方向允许通过电离层的这两个FAC区域之间的电流闭合。我们推测，这些FAC区域可能在其对称方向上对应于助焊剂绳的末端。

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  • 会议地点 Noordwijk(NL);Noordwijk(NL)
  • 作者

    O. Amm; R. Nakamura; H.U. Frey; Y. Ogawa; M. Kubyshkina; A. Balogh; H. Rème;

  • 作者单位

    Finnish Meteorological Institute, Space Physics Program, P.O. Box 503, FIN-00101 Helsinki, Finlandrn(Phone: +358 9 1929-4689, FAX: +358 9 1929-4603, Email: Olaf.Amm@fmi.fi);

    Space Research Institute, Austrian Academy of Sciences, Schmiedlstra?e 6, 8042 Graz, Austria;

    University of California, Space Sciences Laboratory, Centennial Drive at Grizzly Peak Boulevard, Berkeley, CArn94720-7450, USA;

    Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan;

    Institute of Physics, University of St. Petersburg, St. Petersburg 198904, Russia;

    Imperial College London, Space Atmospheric Physics Group, The Blackett Laboratory, Prince Consort Road,rnLondon SW7 2BW, UK;

    CESR/CNRS, 9, Avenue du Colonel Roche, 31028 Toulouse Cedex 4, France;

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