QUASI-PERIODIC ACCELERATION OF ELECTRONS IN THE FLARE ON 2012 JULY 19
文献类型：期刊论文
| 作者 | Huang, Jing1,2 ; Kontar, Eduard P.3; Nakariakov, Valery M.4; Gao, Guannan5; Huang,Jing
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-11-20 |
| 卷号 | 831期号:2 |
| 关键词 | Sun: oscillations Sun: radio radiation Sun: UV radiation |
| 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000387792500005 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6851]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China 3.Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland 4.Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England 5.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R 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, Guannan,&Huang,Jing.(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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来源：国家天文台
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