Interchange reconnection dynamics in a solar coronal pseudo-streamer
Interchange reconnection dynamics in a solar coronal pseudo-streamer
复制标题
日冕伪流光中的交换重联动力学
DOI：
10.1051/0004-6361/202245611
复制
发表时间：
2023
影响因子：
6.5
通讯作者：
Pellegrin-Frachon T
中科院分区：
文献类型：
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作者：
Pellegrin-Frachon T
慢太阳风的产生仍然是太阳物理学中的一个悬而未决的问题。在那些旨在解释行星际介质中日冕等离子体注入的理论中，目前的一个理论是基于交换重联。它假设闭合场和开放场之间的磁连通性交换允许行星际介质中的日冕等离子体注入沿着新重新连接的开放场行进。然而，这种效应背后的确切机制仍然知之甚少，aimsOur的目标是研究这种情况下，在一个特定的磁结构的太阳日冕：一个伪流光。这种拓扑结构位于开放和封闭的磁场之间的接口，并被认为是参与在生成的缓慢的太阳wind.MethodsWe进行了创新的3D磁流体动力学（MHD）模拟的太阳日冕与伪流光，使用自适应细化MHD求解器（ARMS）。通过扰动一个简单的光球，大规模的速度流的准稳态环境状态，我们能够产生一个复杂的动力学的开放和封闭的边界的伪流光。我们研究了许多场线的连接，以了解其精确dynamics.ResultsWe目睹了不同的情况下开放的磁场最初关闭下的伪流光：一步交换重连动力学，沿着更复杂的情况下，包括伪流光和头盔流光之间的耦合，以及开放和封闭的连接域之间的来回重连。最后，我们的分析揭示了一个新开放的磁场在日冕中的高，这可能是由滑动重联解释的大规模运动。结论通过引入一种新的分析方法的磁连通性的演变的基础上，不同的封闭场域，这项研究提供了一个精确的动力学进行的理解，在开放的封闭场，这使得封闭场的注入，行星际介质中的日冕等离子体。进一步的研究将为这些不同的流出流提供综合观测，这些流出流可以由帕克太阳探测器和太阳轨道器测量。
ContextThe generation of the slow solar wind remains an open problem in heliophysics. One of the current theories among those aimed at explaining the injection of coronal plasma in the interplanetary medium is based on interchange reconnection. It assumes that the exchange of magnetic connectivity between closed and open fields allows the injection of coronal plasma in the interplanetary medium to travel along the newly reconnected open field. However, the exact mechanism underlying this effect is still poorly understood.AimsOur objective is to study this scenario in a particular magnetic structure of the solar corona: a pseudo-streamer. This topological structure lies at the interface between open and closed magnetic field and is thought to be involved in the generation of the slow solar wind.MethodsWe performed innovative 3D magnetohydrodynamic (MHD) simulations of the solar corona with a pseudo-streamer, using the Adaptively Refined MHD Solver (ARMS). By perturbing the quasi-steady ambient state with a simple photospheric, large-scale velocity flow, we were able to generate a complex dynamics of the open-and-closed boundary of the pseudo-streamer. We studied the evolution of the connectivity of numerous field lines to understand its precise dynamics.ResultsWe witnessed different scenarios of opening of the magnetic field initially closed under the pseudo-streamer: one-step interchange reconnection dynamics, along with more complex scenarios, including a coupling between pseudo-streamer and helmet streamer, as well as back-and-forth reconnections between open and closed connectivity domains. Finally, our analysis revealed large-scale motions of a newly opened magnetic field high in the corona that may be explained by slipping reconnection.ConclusionsBy introducing a new analysis method for the magnetic connectivity evolution based on distinct closed-field domains, this study provides an understanding of the precise dynamics underway during the opening of a closed field, which enables the injection of closed-field, coronal plasma in the interplanetary medium. Further studies shall provide synthetic observations for these diverse outgoing flows, which could be measured by Parker Solar Probe and Solar Orbiter.