Twisting flux tubes as a cause of micro-flaring activity
Twisting flux tubes as a cause of micro-flaring activity
复制标题
扭曲焊剂管是微扩口活动的原因
DOI：
10.1051/0004-6361:20077916
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
D. S. Bloomfield
中科院分区：
文献类型：
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作者：
D. Jess;R. McAteer;M. Mathioudakis;F. Keenan;A. Andic;D. S. Bloomfield
摘要：本文展示了对太阳活动区NOAA 10794附近一个H -α蓝翼亮点的高频率光学观测结果。这些数据是利用美国国家太阳天文台/萨克拉门托峰的邓恩太阳望远镜，通过一种新开发的相机系统——快速双成像仪获取的。进行了小波分析以寻找与强度相关的振荡特征，发现了周期在15到370秒之间且显著性水平超过95%的周期性。在两次独立的微耀斑事件中，观察到亮点周围的振荡区域发生扭曲。我们将振荡区域的扭曲与物理磁通管的扭曲联系起来，从而引发了重联现象。我们得出平均扭曲速度为8.1千米/秒，并在180°到230°的扭曲角之间检测到发射通量的一个峰值。
Abstract High-cadence optical observations of an H-α blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the rapid dual imager. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km/s and detect a peak in the emitted flux between twist angles of 180° and 230°.