具有三重结构的头盔飘带：阻力动力学模拟
Helmet Streamers with Triple Structures: Simulations of resistive dynamics
摘要：
最近用SOHO航天器上的LASCO日冕仪对日冕进行的观测表明，即使在太阳活动极小期也会出现三重盔状流光，这种流光偶尔会变得不稳定，引起大的日冕物质抛射。还有迹象表明，缓慢的太阳风要么是准静止流和高度波动成分的组合，要么甚至可能完全是由许多小爆发或不稳定性引起的。作为第一步，我们最近提出了一种分析方法来计算简单的二维固定模型的三头盔拖缆配置。在本文中，我们利用含时电阻磁流体动力学方程来研究这些组态的稳定性和动力学行为。我们特别关注单孤立拖缆和三重拖缆的动力学之间可能存在的差异，以及磁重联启动小尺度和大尺度动力学行为的拖缆的方式。我们的研究结果表明，在头盔流光尖端的小爆发可能会不断加速少量的等离子体没有显着的平衡位形的变化，因此可能有助于非定常慢太阳风。在更大的时间和长度尺度上，大规模的日冕喷发可能是流光结构内部大规模磁重联事件的结果。我们的研究结果还表明，三重拖缆通常比单拖缆更稳定。
英文摘要：
Recent observations of the solar corona with the LASCO coronagraph on board of the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to large coronal mass ejections. There are also indications that the slow solar wind is either a combination of a quasi-stationary flow and a highly fluctuating component or may even be caused completely by many small eruptions or instabilities. As a first step we recently presented an analytical method to calculate simple two-dimensional stationary models of triple helmet streamer configurations. In the present contribution we use the equations of time- dependent resistive magnetohydrodynamics to investigate the stability and the dynamical behaviour of these configurations. We particularly focus on the possible differences between the dynamics of single isolated streamers and triple streamers and on the way in which magnetic reconnection initiates both small scale and large scale dynamical behaviour of the streamers. Our results indicate that small eruptions at the helmet streamer cusp may incessantly accelerate small amounts of plasma without significant changes of the equilibrium configuration and might thus contribute to the non-stationary slow solar wind. On larger time and length scales, large coronal eruptions can occur as a consequence of large scale magnetic reconnection events inside the streamer configuration. Our results also show that triple streamers are usually more stable than a single streamer.
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