Paired quasi-periodic pulsations of hard X-ray emission in a solar flare  

作　　者：Hai-Sheng Zhao Dong Li Shao-Lin Xiong Yan-Qiu Zhang Yang Su Wei Chen Yi Zhao Xiao-Bo Li Jia-Cong Liu Wen-Xi Peng Rui Qiao Xin-Qiao Li Xiang-Yang Wen Li-Ming Song Shi-Jie Zheng Xin-Ying Song Xiao-Yun Zhao Yue Huang Shuang-Nan Zhang Shuo Xiao Ce Cai Zheng-Hua An Can Chen Gang Chen Wei Chen Yan-Qi Du Min Gao Ke Gong Dong-Ya Guo Zhi-Wei Guo Jian-Jian He Bin Li Chao Li Chao-Yang Li Gang Li Jian-Hui Li Lu Li Qing-Xin Li Yan-Guo Li Jing Liang Xiao-Hua Liang Jin-Yuan Liao Xiao-Jing Liu Ya-Qing Liu Qi Luo Xiang Ma Bin Meng Ge Ou Dong-Li Shi Jing-Yan Shi Gong-Xing Sun Xi-Lei Sun You-Li Tuo Chen-Wei Wang Hui Wang Jin Wang Jin-Zhou Wang Ping Wang Wen-Shuai Wang Hong Wu Sheng-Lun Xie Yan-Bing Xu Yu-Peng Xu Wang-Chen Xue Sheng Yang Min Yao Jian-Ying Ye Qi-Bin Yi Chao-Yue Zhang Da-Li Zhang Fan Zhang Fei Zhang Hong-Mei Zhang Kai Zhang Peng Zhang Xiao-Lu Zhang Zhen Zhang Guo-Ying Zhao Shi-Yi Zhao Chao Zheng Xing Zhou Yue Zhu 

机构地区：[1]Key Laboratory for Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Department of Astronomy,Beijing Normal University,Beijing 100875,China [5]School of Computing and Artificial Intelligence,Southwest Jiaotong University,Chengdu 611756,China [6]Physics and Space Science College,China West Normal University,Nanchong 637002,China [7]Key Laboratory of Stellar and Interstellar Physics and Department of Physics,Xiangtan University,Xiangtan 411105,China [8]Institute of Astrophysics,Central China Normal University,Wuhan 430079,China [9]School of Physics,Changchun University of Science and Technology,Changchun 130022,China [10]College of Physics and Engineering,Qufu Normal University,Qufu 273165,China [11]College of Physics Sciences&Technology,Hebei University,Baoding 071002,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第5期195-206,共12页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. U1938102, and 11973092);the National Program on Key Research and Development Project (Grant No. 2016YFA0400802);supported by the Surface Project of Jiangsu Province (Grant No. BK20211402)

摘　　要：We investigate high time resolution data obtained by the Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)during the flare event on 2022 April 21 at 01:52 UT.Several subpeaks with durations of 4-6 s have been detected in the hard X-ray precursor phase,and the key feature is that they appear in pairs and seem like double-peak struc-tures.These subpeaks are rarely observed in hard X-ray band and confirmed by the microwave obtained by Nobeyama Radio Polarimeters(NoRP)and Radio Solar Telescope Network(RSTN).While an exponential function can describe the continuum component of the time profile from the precursor to part of the impulsive phase.The periods of quasi-periodic pulsations(QPPs)are detected to be about 7.3 and 12.8 s for the precursor and impulsive phase,respectively,with at least 95%confidence level.The paired QPPs are assumed to be double-peak QPPs and then the scenario of current loop coalescence model is found to be in good agreement with our observation.The precursor phase can be interpreted as the oscillating coalescence of two islands,while the impulsive phase can be interpreted as more islands to coalesce one by one to form larger islands.

关 键 词：solar flare QPPs loop coalescence circular-ribbon flare 

分 类 号：P182[天文地球—天文学]