Somaiyeh Sabri, Stefaan Poedts
Institute of Geophysics, University of Tehran, Tehran, Iran.
Mathematics, KU Leuven, Celestijnenlaan 200B, Leuven, Belgium.
Sci Rep. 2024 Dec 28;14(1):30723. doi: 10.1038/s41598-024-80229-0.
The formation of a S-shaped filament was investigated to determine if and how magnetoacoustic waves in the solar corona can trigger filament excitation. The study investigated how magnetoacoustic waves interact with two magnetic null points in the solar corona. Since the solar corona has a complex magnetic field structure, it is expected that magnetic structures are predominantly responsible for the occurrence of coronal events. Simulation methods are required because of the complex nature of the reconnection problem and the way MHD waves behave. Because of notable progress in the production of supercomputers and the enhancement of techniques, it is now possible to analyze the behaviour of nonlinear plasma near the magnetic null point through numerical methods. This article aims to explore the idea of a 2.5D null point pair and investigate the motion and generation of plasma flow resulting from a solitary magnetoacoustic pulse passing through a particular magnetic structure that contains two null points. In this statement, the PLUTO code, which is a type of code called Godunov, is used to solve a set of equations known as resistive magnetohydrodynamic equations. It was depicted that when transitioning from X-point to O-point, twisted formations are formed, which play a significant role in developing S-shaped filaments. These formations also have a vital function right before the excitement of the filaments.
研究了S形细丝的形成，以确定日冕中的磁声波是否以及如何触发细丝激发。该研究调查了磁声波如何与日冕中的两个磁中性点相互作用。由于日冕具有复杂的磁场结构，预计磁结构是日冕事件发生的主要原因。由于重联问题的复杂性以及磁流体动力学波的行为方式，需要使用模拟方法。由于超级计算机制造和技术提升方面取得了显著进展，现在可以通过数值方法分析磁中性点附近非线性等离子体的行为。本文旨在探讨二维半中性点对的概念，并研究单个磁声脉冲穿过包含两个中性点的特定磁结构时产生的等离子体流的运动和生成。在本研究中，使用一种名为Godunov的代码PLUTO来求解一组称为电阻磁流体动力学方程的方程。结果表明，当从X点过渡到O点时，会形成扭曲结构，这些结构在S形细丝的形成过程中起着重要作用。这些结构在细丝激发之前也起着至关重要的作用。
