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QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19
Huang, Jing1,2; Kontar, Eduard P.3; Nakariakov, Valery M.4; Gao GN(高冠男)5; Huang, J
发表期刊ASTROPHYSICAL JOURNAL
2016-11-20
卷号831期号:2
DOI10.3847/0004-637X/831/2/119
产权排序第5完成单位
收录类别SCI
关键词Sun: Oscillations Sun: Radio Radiation Sun: Uv Radiation
摘要Quasi-periodic pulsations (QPPs) of nonthermal emission in an M7.7 class flare on 2012 July 19 are investigated with spatially resolved observations at microwave and. HXR bands and with spectral observations at decimetric, metric waves. Microwave emission at 17 GHz of two footpoints, HXR emission at 20-50 keV of the. north footpoint and loop top, and type III bursts at 0.7-3 GHz show prominent in-phase oscillations at 270 s. The microwave emission of the. loop leg has less pulsation. but stronger emission. Through the. estimation of plasma density around the loop top from EUV observations, we find that the local plasma frequency would be 1.5 GHz or even higher. Thus, type III bursts at 700 MHz originate above the loop top. Quasi-periodic acceleration or injection of energetic electrons is proposed to dominate these. in-phase QPPs of nonthermal emission from footpoints, loop top, and above. In the. overlying region, drifting pulsations (DPS) at 200-600 MHz oscillate at a distinct period (200 s). Its global structure drifts toward lower frequency, which is closely related to upward plasmoids observed simultaneously from EUV emission. Hence, nonthermal emission from overlying plasmoids and underlying flaring loops show. different oscillating periods. Two individual systems of quasi-periodic acceleration of electrons are proposed to coincide in the bi-direction outflows from the. reconnection region.
项目资助者NSFC(11573039, 11273030, 11221063, 11103044, 11373039) ; National Major Scientific Equipment RD Project(ZDYZ2009-3) ; Specialized Research Fund for State Key Laboratories(15010009 (2015-25F-04)) ; GA CR(P209/12/0103) ; Marie Curie project(PIRSES-GA-295272-RADIOSUN)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000387792500005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]X-RAY OBSERVATIONS ; SOLAR-FLARE ; MAGNETIC RECONNECTION ; FINE-STRUCTURES ; RADIO-EMISSION ; PULSATIONS ; BURSTS ; LOOPS ; EVENT ; TRAP
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9774
专题射电天文研究组
通讯作者Huang, J
作者单位1.Key Laboratory of Solar Activities, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
2.Sate Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, 100190, China
3.School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
4.Physics Department, University of Warwick, Coventry CV4 7AL, UK
5.Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
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Huang, Jing,Kontar, Eduard P.,Nakariakov, Valery M.,et al. QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19[J]. ASTROPHYSICAL JOURNAL,2016,831(2).
APA Huang, Jing,Kontar, Eduard P.,Nakariakov, Valery M.,Gao GN,&Huang, J.(2016).QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19.ASTROPHYSICAL JOURNAL,831(2).
MLA Huang, Jing,et al."QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19".ASTROPHYSICAL JOURNAL 831.2(2016).
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