Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations

Excitation of Multiperiodic Kink Motions in Solar Flare Loops: Possible Application to Quasiperiodic Pulsations
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太阳耀斑环中多周期扭结运动的激发:在准周期脉动中的可能应用

DOI:
10.3847/2041-8213/acb3c6
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发表时间:
2023-01
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
Shengju Yuan
Shengju Yuan
中科院分区:
其他
文献类型:
--
作者:
Mijie Shi;Bo Li;Shao-Xia Chen;Mingzhe Guo;Shengju Yuan

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磁流体动力学(MHD)波经常被用来解释太阳耀斑中的准周期脉动(QPP)。我们使用三维MHD模拟研究了直耀斑环对扭结状速度扰动的响应,并使用快速回旋同步加速器程序对微波辐射进行了正演模拟。具有两个周期的扭结运动同时产生,长周期分量(PL = 57 s)归因于径向基本扭结模式和短周期分量(PS = 5.8 s)的第一泄漏扭结模式。正演模拟结果表明,在某些视线范围内,微波强度存在双周期振荡。将光束尺寸增加到(1″)2并不能消除微波振荡。我们建议,第一泄漏扭结模式是一个很有前途的候选机制,占短周期QPP。具有高空间分辨率的射电望远镜可以帮助区分这种新机制和香肠模式等传统解释。
Magnetohydrodynamic (MHD) waves are often invoked to interpret quasiperiodic pulsations (QPPs) in solar flares. We study the response of a straight flare loop to a kink-like velocity perturbation using three-dimensional MHD simulations and forward model the microwave emissions using the fast gyrosynchrotron code. Kink motions with two periodicities are simultaneously generated, with the long-period component (P L = 57 s) being attributed to the radial fundamental kink mode and the short-period component (P S = 5.8 s) to the first leaky kink mode. Forward modeling results show that the two-periodic oscillations are detectable in the microwave intensities for some lines of sight. Increasing the beam size to (1″)2 does not wipe out the microwave oscillations. We propose that the first leaky kink mode is a promising candidate mechanism to account for short-period QPPs. Radio telescopes with high spatial resolutions can help distinguish between this new mechanism and such customary interpretations as sausage modes.
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