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

被引：9

作者：

Zhao, Hai-Sheng ^{[1
]}

Li, Dong ^{[2
]}

Xiong, Shao-Lin ^{[1
]}

Zhang, Yan-Qiu ^{[1
,3
]}

Su, Yang ^{[2
]}

Chen, Wei ^{[2
]}

Zhao, Yi ^{[1
,4
]}

Li, Xiao-Bo ^{[1
]}

Liu, Jia-Cong ^{[1
]}

Peng, Wen-Xi ^{[1
]}

Qiao, Rui ^{[1
]}

Li, Xin-Qiao ^{[1
]}

Wen, Xiang-Yang ^{[1
]}

Song, Li-Ming ^{[1
]}

Zheng, Shi-Jie ^{[1
]}

Song, Xin-Ying ^{[1
]}

Zhao, Xiao-Yun ^{[1
]}

Huang, Yue ^{[1
]}

Zhang, Shuang-Nan ^{[1
]}

Xiao, Shuo ^{[1
,3
]}

Cai, Ce ^{[1
,3
]}

An, Zheng-Hua ^{[1
]}

Chen, Can ^{[1
,3
]}

Chen, Gang ^{[1
]}

Du, Yan-Qi ^{[1
,5
]}

Gao, Min ^{[1
]}

Gong, Ke ^{[1
]}

Guo, Dong-Ya ^{[1
]}

Guo, Zhi-Wei ^{[1
,11
]}

He, Jian-Jian ^{[1
]}

Li, Bin ^{[1
]}

Li, Chao ^{[1
,7
]}

Li, Chao-Yang ^{[1
,6
]}

Li, Gang ^{[1
]}

Li, Jian-Hui ^{[1
,3
]}

Li, Lu ^{[1
]}

Li, Qing-Xin ^{[1
,7
]}

Li, Yan-Guo ^{[1
]}

Liang, Jing ^{[1
,5
]}

Liang, Xiao-Hua ^{[1
]}

Liao, Jin-Yuan ^{[1
]}

Liu, Xiao-Jing ^{[1
]}

Liu, Ya-Qing ^{[1
]}

Luo, Qi ^{[1
,3
]}

Ma, Xiang ^{[1
]}

Meng, Bin ^{[1
]}

Ou, Ge ^{[1
]}

Shi, Dong-Li ^{[1
,5
]}

Shi, Jing-Yan ^{[1
]}

Sun, Gong-Xing ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China

[5] Southwest Jiaotong Univ, Sch Comp & Artificial Intelligence, Chengdu 611756, Peoples R China

[6] China West Normal Univ, Phys & Space Sci Coll, Nanchong 637002, Peoples R China

[7] Xiangtan Univ, Dept Phys, Key Lab Stellar & Interstellar Phys, Xiangtan 411105, Peoples R China

[8] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China

[9] Changchun Univ Sci & Technol, Sch Phys, Changchun 130022, Peoples R China

[10] Qufu Normal Univ, Coll Phys & Engn, Qufu 273165, Peoples R China

[11] Hebei Univ, Coll Phys Sci & Technol, Baoding 071002, Peoples R China

来源：

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2023年 / 66卷 / 05期

基金：

中国国家自然科学基金;

关键词：

solar flare; QPPs; loop coalescence; circular-ribbon flare; CHROMOSPHERIC EVAPORATION; FLUCTUATIONS; IRIS;

D O I：

10.1007/s11433-022-2064-6

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 4-6s 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 structures. 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 12.8s 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.

引用

页数：12

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