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arXiv 2107.02247astro-ph.SR
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耀斑引起的日冕环无衰减横向振荡

Flare induced decay-less transverse oscillations in solar coronal loops

Sudip Mandal, Hui Tian, Hardi Peter

摘要:

耀斑引起的,大振幅,无衰减的横向振荡的证据。大气成像组件(AIA)观测到的一个多热日冕环系统,在其中一个环足点附近爆发耀斑后,表现出无衰减的横向振荡。测量的振荡周期位于4.2分钟和6.9分钟之间,其中的位移振幅范围从0.17毫米至1.16毫米。一个运动放大技术是用来检测耀斑前的衰减无振荡。这些振荡具有类似的周期(3.7分钟和5.0分钟之间),像以前的,但他们的振幅(0.04毫米至0.12毫米)被发现是显着较小。当通过特定的AIA通道观察或当比较它们的多通道特征时,在循环的振荡线程之间没有发现相位差。这些特征表明,在这种情况下,耀斑的发生既没有改变这些振荡的性质(衰减与无衰减),也没有改变振荡周期。耀斑的唯一影响是增加振荡幅度。

英文摘要:

Evidence of flare induced, large-amplitude, decay-less transverse oscillations is presented. A system of multi-thermal coronal loops as observed with the Atmospheric Imaging Assembly (AIA), exhibit decay-less transverse oscillations after a flare erupts nearby one of the loop footpoints. Measured oscillation periods lie between 4.2 min and 6.9 min wherein the displacement amplitudes range from 0.17 Mm to 1.16 Mm. A motion-magnification technique is employed to detect the pre-flare decay-less oscillations. These oscillations have similar periods (between 3.7 min and 5.0 min) like the previous ones but their amplitudes (0.04 Mm to 0.12 Mm) are found to be significantly smaller. No phase difference is found among oscillating threads of a loop when observed through a particular AIA channel or when their multi-channel signatures are compared. These features suggest that the occurrence of a flare in this case neither changed the nature of these oscillations (decaying vs decay-less) nor the oscillation periods. The only effect the flare has is to increase the oscillation amplitudes.

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