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arXiv 1602.06370astro-ph.SR
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太阳色球层磁重联后新形成环的振荡

Oscillation of Newly Formed Loops After Magnetic Reconnection in the Solar Chromosphere

Shuhong Yang, Yongyuan Xiang

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Accepted for publication in ApJL
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摘要：

利用新真空太阳望远镜的高时空分辨率H $α$图像，我们重点研究了动态色球层中两组X形环。我们发现，反定向回路相互接近，并不断重新连接。循环的连通性改变，新的循环形成并堆叠在一起。堆叠的线圈急剧弯曲，这意味着它们受到磁张力的极大影响。当另一个重连过程发生时，一个新的环形成并与先前形成的环堆叠。与此同时，堆叠的环突然收缩并向平衡位置移动，进行过冲运动，导致平均周期约为45 s的振荡。首次观测到色球层中磁重联后新形成的磁环的振荡现象。我们认为，由于最后一个新环的加入，堆叠环的稳定性被破坏，然后在磁张力的作用下突然缩回。由于回缩，另一个较低的环被向外推，并以约25 s的周期进行振荡。不同的振荡周期可能是由于它们在三个参数上的差异，即，回路长度、等离子体密度和磁场强度。

英文摘要：

With the high spatial and temporal resolution H$α$ images from the New Vacuum Solar Telescope, we focus on two groups of loops with a X-shaped configuration in the dynamic chromosphere. We find that the anti-directed loops approach each other and reconnect continually. The connectivity of the loops is changed and new loops are formed and stack together. The stacked loops are sharply bent, implying that they are greatly impacted by the magnetic tension force. When another more reconnection process takes place, one new loop is formed and stacks with the previously formed ones. Meanwhile, the stacked loops retract suddenly and move toward the balance position, performing an overshoot movement, which led to an oscillation with an average period of about 45 s. The oscillation of newly formed loops after magnetic reconnection in the chromosphere is observed for the first time. We suggest that the stability of the stacked loops is destroyed due to the join of the last new loop and then suddenly retract under the effect of magnetic tension. Because of the retraction, another lower loop is pushed outward and performs an oscillation with the period of about 25 s. The different oscillation periods may be due to their difference in three parameters, i.e., loop length, plasma density, and magnetic field strength.

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