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arXiv 1902.09649astro-ph.SR
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作为SDO/AIA观测的冕环横向振荡的阻尼机制的共振吸收

Resonant absorption as a damping mechanism for the transverse oscillations of the coronal loops observed by SDO/AIA

Javad Ganjali, Nastaran Farhang, Shahriar Esmaeili, Mohsen Javaherian, Hossein Safari

摘要:

日冕环代表了快、中、慢三种正常模式振荡。在这项研究中,使用太阳的极紫外(EUV)图像分析了几分钟周期的回路的横向振荡,以及由共振吸收引起的阻尼。利用太阳动力学观测站(SDO)/大气成像组件(AIA)的171个$Å$观测资料,分析了日冕环振荡的周期、阻尼时间、环长和环宽等参数。对于2013年10月11日观测到的环,该环的周期和阻尼分别为19和70分钟。阻尼质量,阻尼时间与周期的比率,计算为约3.6。2013年1月22日记录的提取环的周期和阻尼时间分别约为81和6.79分钟。阻尼质量也计算为12。结果表明,环路横向振荡的阻尼属于强阻尼区,谐振吸收是环路横向振荡阻尼的主要原因。

英文摘要:

Solar coronal loops represent the variety of fast, intermediate, and slow normal mode oscillations. In this study, the transverse oscillations of the loops with a few-minutes period and also with damping caused by the resonant absorption were analyzed using extreme ultraviolet (EUV) images of the Sun. We employed the 171 $Å$ data recorded by Solar Dynamic Observatory (SDO)/Atmospheric Imaging Assembly (AIA) to analyze the parameters of coronal loop oscillations such as period, damping time, loop length, and loop width. For the loop observed on 11 October 2013, the period and the damping of this loop are obtained to be 19 and 70 minutes, respectively. The damping quality, the ratio of the damping time to the period, is computed about 3.6. The period and damping time for the extracted loop recorded on 22 January 2013 are about 81 and 6.79 minutes, respectively. The damping quality is also computed as 12. It can be concluded that the damping of the transverse oscillations of the loops is in the strong damping regime, so resonant absorption would be the main reason for the damping.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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