日冕中无衰减振荡的研究进展

Research Progress of Decayless Oscillations in the Solar Corona

日冕中冕环的无衰减横向振荡(简称无衰减振荡)自2012年被发现以来,受到了广泛的关注.无衰减振荡具有在日冕中广泛存在以及振幅无明显变小的特性,使之在解释日冕加热和冕震学诊断上都具有相当的潜力.总结了日冕中无衰减振荡的研究进展,包括观测研究得到的一系列结果、提出的理论和数值模型以及基于无衰减振荡进行冕震学诊断的一些尝试,并且展望了未来可以进一步开展的研究.

Decayless transverse kink oscillations of solar coronal loops(or decayless oscillations for short)have attracted great attention since their discovery.In contrast to the previously reported decaying kink oscillations,they are not associated with any external impulsive events and are found to show no obvious decay of amplitude.Besides,their ubiquitous existence suggests that they might play an important role in the process of coronal heating and diagnostics of the properties of coronal loops.In this review,we summarize the research progress of decayless oscillations.The observational results include their amplitude,period,scaling rules,polarization and multiple harmonics.We also introduce different types of theoretical models on their generation mechanisms.Moreover,we also give some examples of their application in coronal seismology.In the last section of this review,we discuss future perspectives on the research of decayless oscillations.