Quasi-periodic Pulsations of Gamma-Ray Emissions from a Solar Flare on 2017 September 6

Quasi-periodic Pulsations of Gamma-Ray Emissions from a Solar Flare on 2017 September 6
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2017 年 9 月 6 日太阳耀斑伽马射线发射的准周期脉动

DOI:
10.3847/1538-4357/ab5e86
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发表时间:
2019-12
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Z. J. Ning
Z. J. Ning
中科院分区:
其他
文献类型:
--
作者:
D. Li;D. Y. Kolotkov;V. M. Nakariakov;L. Lu;Z. J. Ning

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我们研究了X9.3耀斑(SOL 2017-Sep-06 T11:53)的高能非热辐射的准周期脉动(QPP),这是自太阳活动周期24开始以来最强大的耀斑。QPP是由Konus-Wind记录的γ和硬X射线(HXR)通道的光变曲线中的一系列规则和重复的峰,以及由CALLISTO射电频谱仪在脉冲阶段测量的射电和微波通量。从整体小波和傅立叶功率谱确定的周期为24-30 s的HXR和微波通道,这是与非热电子,和24 - 30 s的γ射线波段有关的非热离子。在脉冲阶段,非热电子和离子都可以通过重复的磁重联来加速。然而,我们不能排除其他机制,如磁流体动力学振荡的香肠模式。由于X9. 3耀斑的能量范围与典型的恒星耀斑相当,因此QPP的探测有助于理解太阳耀斑中粒子的加速和动力学过程,也有助于弥合恒星耀斑和太阳耀斑之间的差距。
We investigate quasi-periodic pulsations (QPPs) of high-energy nonthermal emissions from an X9.3 flare (SOL2017-Sep-06T11:53), the most powerful flare since the beginning of solar cycle 24. The QPPs are identified as a series of regular and repeating peaks in the light curves in the γ- and hard X-ray (HXR) channels recorded by the Konus-Wind, as well as the radio and microwave fluxes measured by the CALLISTO radio spectrograph during the impulsive phase. The periods are determined from the global wavelet and Fourier power spectra as 24–30 s in the HXR and microwave channels, which are associated with nonthermal electrons, and ∼20 s in the γ-ray band related to nonthermal ions. Both nonthermal electrons and ions may be accelerated by repetitive magnetic reconnection during the impulsive phase. However, we could not rule out other mechanisms, such as magnetohydrodynamic oscillation in a sausage mode. The QPP detected in this study is useful for understanding the particle acceleration and dynamic process in solar flares and also bridging the gap between stellar and solar flares because the energy realm of the X9.3 solar flare is almost comparable to a typical stellar flare.
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