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:
影响因子:
--
通讯作者:
Z. J. Ning
中科院分区:
文献类型:
--
作者:
D. Li;D. Y. Kolotkov;V. M. Nakariakov;L. Lu;Z. J. Ning
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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DOI:
10.3847/2041-8213/aaeace
发表时间:
2018-10
期刊:
The Astrophysical Journal Letters
影响因子:
--
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DOI:
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发表时间:
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Earth, Moon, and Planets
影响因子:
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DOI:
10.3847/1538-4357/833/2/284
发表时间:
2016-10
期刊:
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影响因子:
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通讯作者:
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影响因子:
6.5
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DOI:
10.3847/2041-8213/aa8f3a
发表时间:
2017-09
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
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通讯作者:
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