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arXiv 1605.03320astro-ph.SR
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太阳暗条和附近日冕环之间的磁重联

Magnetic reconnection between a solar filament and nearby coronal loops

Leping Li, Jun Zhang, Hardi Peter, Eric Priest, Huadong Chen, Lijia Guo, Feng Chen, Duncan Mackay

摘要:

磁重联,即磁场拓扑结构的重新排列,是遍布宇宙的磁化等离子体系统中的基本物理过程1,2。其过程难以直接观察。日冕结构,如日冕环和暗条脊,经常描绘出太阳日冕中的磁场几何形状及其变化。在这里,我们展示了一个高度暗示性的观测,即在爆发的太阳暗条和附近的日冕环之间的磁重联,导致暗条连接的变化。当爆发的灯丝遇到环时,X型结构形成。灯丝变直,明亮的电流片在与线圈的界面处形成。许多等离子体团出现在这些电流片和双向传播。细丝从电流片断开,电流片逐渐分散和消失,重新连接到回路,并重新定向到回路足点。暗条和磁环的这种演化表明了理论1所预言的连续的磁重联,但在观测中很少能如此清晰地发现。我们的研究结果的形成,演变和消失的电流片,确认三维磁重联理论和耗散区的演变和释放的磁能在许多磁化等离子体系统的重联的影响。

英文摘要:

Magnetic reconnection, the rearrangement of magnetic field topology, is a fundamental physical process in magnetized plasma systems all over the universe1,2. Its process is difficult to be directly observed. Coronal structures, such as coronal loops and filament spines, often sketch the magnetic field geometry and its changes in the solar corona3. Here we show a highly suggestive observation of magnetic reconnection between an erupting solar filament and its nearby coronal loops, resulting in changes in connection of the filament. X-type structures form when the erupting filament encounters the loops. The filament becomes straight, and bright current sheets form at the interfaces with the loops. Many plasmoids appear in these current sheets and propagate bi-directionally. The filament disconnects from the current sheets, which gradually disperse and disappear, reconnects to the loops, and becomes redirected to the loop footpoints. This evolution of the filament and the loops suggests successive magnetic reconnection predicted by theories1 but rarely detected with such clarity in observations. Our results on the formation, evolution, and disappearance of current sheets, confirm three-dimensional magnetic reconnection theory and have implications for the evolution of dissipation regions and the release of magnetic energy for reconnection in many magnetized plasma systems.

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