从EUV、H-α和微波观测中看到的爆发丝状体的大振幅振荡
Large-Amplitude Oscillation of an Erupting Filament as Seen in EUV, H-alpha and Microwave Observations
摘要：
我们提出了一个大振幅振荡的极冠细丝在2002年10月15日的多波长观测。振荡发生在暗条缓慢上升（约1 km/s）的过程中。它在突然加速和爆发之前完成了三个周期。在SOHO上的极紫外成像望远镜记录的观测中，可以清楚地看到振荡和随后的喷发。这种振荡只出现在灯丝的一部分，而且它看起来是一种驻波而不是一种传播波。振荡周期约为两小时，在振荡期间没有明显变化。我们还确定了振荡作为一个“闪烁的灯丝”在耀斑监测望远镜拍摄的H-α图像，并作为一个空间位移在17 GHz的微波图像从野边山射电日像仪（NoRH）。灯丝振荡似乎是由灯丝倒钩和附近出现的磁通量之间的磁重联触发的，这一点从MDI磁图观测中可以看出。没有观察到耀斑与振荡的开始有关。我们还讨论了可能的影响的振荡作为诊断工具的喷发机制。我们认为，在喷发的早期阶段，一部分暗条首先失去平衡，而其余部分仍处于平衡状态并振荡。
英文摘要：
We present multiwavelength observations of a large-amplitude oscillation of a polar crown filament on 15 October 2002. The oscillation occurred during the slow rise (about 1 km/s) of the filament. It completed three cycles before sudden acceleration and eruption. The oscillation and following eruption were clearly seen in observations recorded by the Extreme-Ultraviolet Imaging Telescope onboard SOHO. The oscillation was seen only in a part of the filament, and it appears to be a standing oscillation rather than a propagating wave. The period of oscillation was about two hours and did not change significantly during the oscillation. We also identified the oscillation as a "winking filament" in the H-alpha images taken by the Flare Monitoring Telescope, and as a spatial displacement in 17 GHz microwave images from Nobeyama Radio Heliograph (NoRH). The filament oscillation seems to be triggered by magnetic reconnection between a filament barb and nearby emerging magnetic flux as was evident from the MDI magnetogram observations. No flare was observed to be associated with the onset of the oscillation. We also discuss possible implications of the oscillation as a diagnostic tool for the eruption mechanisms. We suggest that in the early phase of eruption a part of the filament lost its equilibrium first, while the remaining part was still in an equilibrium and oscillated.
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