QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19

	QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19
	Huang, Jing 1,2; Kontar, Eduard P.3; Nakariakov, Valery M.4; Gao GN(高冠男)5
刊名	ASTROPHYSICAL JOURNAL
	2016-11-20
卷号	831 期号:2
关键词	Sun: oscillations Sun: radio radiation Sun: UV radiation
ISSN号	0004-637X
通讯作者	Huang, J
产权排序	第五完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY OBSERVATIONS ; SOLAR-FLARE ; MAGNETIC RECONNECTION ; FINE-STRUCTURES ; RADIO-EMISSION ; PULSATIONS ; BURSTS ; LOOPS ; EVENT ; TRAP
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.3847/0004-637X/831/2/119/meta
语种	英语
WOS记录号	WOS:000387792500005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9774]
专题	云南天文台_射电天文研究组
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
推荐引用方式 GB/T 7714	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.(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).