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ASYMMETRIC MAGNETIC RECONNECTION IN SOLAR FLARE AND CORONAL MASS EJECTION CURRENT SHEETS

机译:太阳耀斑和冠状物质射出电流片中的不对称磁重合

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We present two-dimensional resistive magnetohydrodynamic simulations of line-tied asymmetric magnetic reconnection in the context of solar flare and coronal mass ejection current sheets. The reconnection process is made asymmetric along the inflow direction by allowing the initial upstream magnetic field strengths and densities to differ, and along the outflow direction by placing the initial perturbation near a conducting wall boundary that represents the photosphere. When the upstream magnetic fields are asymmetric, the post-flare loop structure is distorted into a characteristic skewed candle flame shape. The simulations can thus be used to provide constraints on the reconnection asymmetry in post-flare loops. More hard X-ray emission is expected to occur at the footpoint on the weak magnetic field side because energetic particles are more likely to escape the magnetic mirror there than at the strong magnetic field footpoint. The footpoint on the weak magnetic field side is predicted to move more quickly because of the requirement in two dimensions that equal amounts of flux must be reconnected from each upstream region. The X-line drifts away from the conducting wall in all simulations with asymmetric outflow and into the strong magnetic field region during most of the simulations with asymmetric inflow. There is net plasma flow across the X-line for both the inflow and outflow directions. The reconnection exhaust directed away from the obstructing wall is significantly faster than the exhaust directed toward it. The asymmetric inflow condition allows net vorticity in the rising outflow plasmoid which would appear as rolling motions about the flux rope axis.
机译:我们提出了在太阳耀斑和日冕物质抛射电流表的背景下,线系不对称磁重联的二维电阻磁流体动力学模拟。通过允许初始上游磁场强度和密度不同,使重新连接过程沿流入方向不对称,并且通过将初始扰动置于代表光球的导电壁边界附近,使重新连接过程沿流出方向不对称。当上游磁场不对称时,耀斑后环结构会扭曲为特征性的偏斜烛形火焰形状。因此,仿真可用于为耀斑后环路中的重新连接不对称提供约束。预计在弱磁场侧的脚点会发生更多的硬X射线发射,因为与强磁场脚点相比,高能粒子更可能从那里逃离磁镜。由于在二维上要求必须从每个上游区域重新连接等量的磁通量,因此预计弱磁场侧的脚点将移动得更快。在所有不对称流出的模拟中,X线都会从传导壁漂移,而在大多数不对称流入的模拟中,X线会移入强磁场区域。 X线的流入和流出方向都有净血浆流。引导离开障碍壁的重新连接排气比引导进入障碍壁的排气明显更快。非对称流入条件允许上升的流出等离子体中的净涡旋,该涡旋将表现为围绕磁通量绳轴的滚动运动。

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