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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MHD description of the dynamical relationships between a flux rope, streamer, coronal mass ejection, and magnetic cloud: An analysis of the January 1997 Sun-Earth connection event
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MHD description of the dynamical relationships between a flux rope, streamer, coronal mass ejection, and magnetic cloud: An analysis of the January 1997 Sun-Earth connection event

机译：MHD描述通量绳，拖缆，日冕物质抛射和磁云之间的动力学关系：1997年1月日地连接事件的分析

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We investigate the dynamical relationships between a coronal flux rope, a streamer, a coronal mass ejection (CME), and a magnetic cloud by using observations from the satellites of the International Solar-Terrestrial Physics observatories together with a streamer and flux rope interaction model [Wu and Guo, 1997a]. This is the first physical description of the evolution of a CME related to a flux rope in a streamer near the Sun to a magnetic cloud at 1 AU. The distinctive physical configuration of the model is based on a theoretical suggestion [Low, 1994] and observations [Hundhausen, 1993] that the magnetic structure of a streamer with an embedded cavity provides favorable condition for launch of a CME. We explore this physical scenario by identifying a flux rope as the cavity and using a fully self-consistent numerical simulation to illustrate the dynamical process of evolution of the flux rope/CME into a magnetic cloud. The simulation results are then compared to solar and interplanetary data from the well-observed Sun-Earth connection event of January 6-12, 1997. The data used for this analysis were collected chiefly by the Solar and Heliospheric Observatory (SOHO) Large-Angle and Spectrometric Coronagraph Experiment coronagraph and the solar wind particle and field sensors on the Wind spacecraft, but ground-based solar data were used as well. Because we have detailed observations of the same disturbance both at the Sun (SOHO) and at 1 AU (Wind), this event gives us an unusual opportunity to test the magnetohydrodynamic methodology and to learn about the physical processes of the sun-Earth connection. In this study we show that when the flux rope rises (owing to increasing axial current, as assumed here, or to some other mechanism), it disrupts the streamer-flux rope system, thus launching a coronal mass ejection. The flux rope then escapes from the streamer and evolves to become a magnetic cloud, as expected, in interplanetary space. The CME is a visible feature moving ahead of the flux rope. The model also predicts a fast-mode shock in front of the magnetic cloud, as observed.
机译：我们使用国际太阳-地面物理观测站的卫星观测数据以及拖缆和通量绳相互作用模型[[ Wu and Guo，1997a]。这是关于CME的第一个物理描述，该CME与太阳附近的拖缆中的通量绳在1 AU时演变为磁云有关。该模型独特的物理构造是基于理论上的建议[Low，1994]和观察结果[Hundhausen，1993]，即带有嵌入式空腔的拖缆的磁结构为发射CME提供了有利条件。我们通过将磁通绳识别为空腔并使用完全自洽的数值模拟来说明磁通绳/ CME演变成磁云的动力学过程，从而探索了这种物理情况。然后将模拟结果与1997年1月6日至12日观测到的日地连接事件得到的太阳和行星际数据进行比较。用于此分析的数据主要是由大角度太阳和日球天文台（SOHO）收集的光谱仪和日冕光谱仪实验型日冕仪和“风”飞船上的太阳风粒子和场传感器，但也使用了基于地面的太阳数据。由于我们已经对太阳（SOHO）和1 AU（风）处的相同扰动进行了详细观察，因此该事件为我们提供了一个难得的机会来测试磁流体力学方法并了解日地连接的物理过程。在这项研究中，我们表明，当磁通量绳上升时（由于轴向电流增加，如此处假定的，或由于其他某种机制），它会扰乱流光通量绳系统，从而引发日冕物质抛射。然后，磁通绳从拖缆中逸出并演变成在行星际空间中的磁性云。 CME是移动到助焊剂绳索之前的可见特征。如所观察到的，该模型还预测了磁云前面的快速模式冲击。

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