Observation of a reversal of rotation in a sunspot during a solar flare.

Observation of a reversal of rotation in a sunspot during a solar flare.
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太阳耀斑期间太阳黑子旋转逆转的观测

DOI:
10.1038/ncomms13798
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发表时间:
2016-12-13
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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耀斑期间光球通量的突然运动被认为是日冕场重构引起的反作用。然而,运动模式的类型和负责反反应的物理机制一直不确定。在这里,我们表明,一个太阳黑子的旋转方向是反向的X1.6耀斑期间使用日震和磁成像仪的观测。磁场外推模型表明,相应的日冕磁场随着磁扭曲密度的增加而收缩。这表明,太阳黑子的突然反转可能是由洛伦兹力矩驱动的,洛伦兹力矩是由从日冕到太阳内部的扭曲密度梯度产生的。这些结果支持这样的观点,即黑子自转的突然反转是一个动态过程,是对耀斑期间日冕磁场收缩的响应。
The abrupt motion of the photospheric flux during a solar flare is thought to be a back reaction caused by the coronal field reconfiguration. However, the type of motion pattern and the physical mechanism responsible for the back reaction has been uncertain. Here we show that the direction of a sunspot’s rotation is reversed during an X1.6 flare using observations from the Helioseismic and Magnetic Imager. A magnetic field extrapolation model shows that the corresponding coronal magnetic field shrinks with increasing magnetic twist density. This suggests that the abrupt reversal of rotation in the sunspot may be driven by a Lorentz torque that is produced by the gradient of twist density from the solar corona to the solar interior. These results support the view that the abrupt reversal in the rotation of the sunspot is a dynamic process responding to shrinkage of the coronal magnetic field during the flare.
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期刊: SOLAR PHYSICS
影响因子: 2.8
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