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首页> 外文期刊>The Astrophysical journal >SELF-CONSISTENT MAGNETOHYDRODYNAMIC MODELING OF A CORONAL MASS EJECTION, CORONAL DIMMING, AND A GIANT CUSP-SHAPED ARCADE FORMATION
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SELF-CONSISTENT MAGNETOHYDRODYNAMIC MODELING OF A CORONAL MASS EJECTION, CORONAL DIMMING, AND A GIANT CUSP-SHAPED ARCADE FORMATION

机译：冠状物质喷射，冠状变位和巨型杯状弧形形成的自洽磁氢动力模型

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We performed magnetohydrodynamic simulations of coronal mass ejections (CMEs) and associated giant arcade formations, and the results suggest new interpretations of observations of CMEs. We performed two cases of the simulation: with and without heat conduction. Comparing between the results of the two cases, we found that the recon-nection rate in the conductive case is a little higher than that in the adiabatic case and that the temperature of the loop top is consistent with the theoretical value predicted by the Yokoyama-Shibata scaling law. The dynamical properties such as velocity and magnetic field are similar in the two cases, whereas thermal properties such as temperature and density are very different. In both cases, slow shocks associated with magnetic reconnection propagate from the recon-nection region along the magnetic field lines around the flux rope, and the shock fronts form spiral patterns. Just outside the slow shocks, the plasma density decreases greatly. The soft X-ray images synthesized from the numerical results are compared with the soft X-ray images of a giant arcade observed with the Soft X-Ray Telescope aboard Yohkoh; it is confirmed that the effect of heat conduction is significant for the detailed comparison between simulation and observation. The comparison between synthesized and observed soft X-ray images provides new interpretations of various features associated with CMEs and giant arcades. (1) It is likely that the Y-shaped ejecting structure, observed in the giant arcade on 1992 January 24, corresponds to slow and fast shocks associated with magnetic reconnection. (2) Soft X-ray twin dimming corresponds to the rarefaction induced by reconnection. (3) The inner boundary of the dimming region corresponds to the slow shocks. (4) The "three-part structure" of a CME can be explained by our numerical results. (5) The numerical results also suggest that a backbone feature of a flare/giant arcade may correspond to the fast shock formed by the collision of the downward reconnection outflow.
机译：我们进行了冠状物质抛射（CMEs）及其相关的大型拱廊形成的磁流体动力学模拟，结果提示了对CMEs观测的新解释。我们执行了两种模拟情况：有导热和无导热。比较这两种情况的结果，我们发现导电情况下的重新连接速率比绝热情况下的重新连接速率高一点，并且回路顶部的温度与横山电机预测的理论值一致。 Shibata缩放比例法。在这两种情况下，动力学特性（例如速度和磁场）相似，而热力学特性（例如温度和密度）则非常不同。在这两种情况下，与磁重新连接相关的慢速冲击都沿着磁通绳周围的磁力线从重合区域传播，并且冲击波前部形成螺旋形。就在缓慢的冲击之外，等离子体密度大大降低。将根据数值结果合成的软X射线图像与用Yohkoh上的软X射线望远镜观察到的巨型拱廊的软X射线图像进行比较；可以确认，对于模拟和观察之间的详细比较，热传导的影响是显着的。合成的软X射线图像和观察到的软X射线图像之间的比较为与CME和大型拱廊相关的各种特征提供了新的解释。 （1）在1992年1月24日的巨型拱廊中观察到的Y形弹出结构很可能对应于与磁重新连接相关的慢速和快速冲击。 （2）柔和的X射线孪生调光对应于重新连接引起的稀疏。 （3）调光区域的内边界对应于慢速冲击。 （4）CME的“三部分结构”可以用我们的数值结果来解释。 （5）数值结果还表明，火炬/巨型拱廊的主干特征可能与向下重新连接流出的碰撞形成的快速冲击相对应。

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