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题名: MICROWAVE TYPE III PAIR BURSTS IN SOLAR FLARES
作者: Tan, Baolin1; Meszarosova, Hana2; Karlicky, Marian2; Huang, Guangli3; Tan, Chengming1
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-03-01
卷号: 819, 期号:1
关键词: Sun: corona ; Sun: flares ; Sun: particle emission ; Sun: radio radiation
DOI: 10.3847/0004-637X/819/1/42
文章类型: Article
英文摘要: A solar microwave type III pair burst is composed of normal and reverse-sloped (RS) burst branches with oppositely fast frequency drifts. It is the most sensitive signature of the primary energy release and electron accelerations in flares. This work reports. 11 microwave type III pair events in 9 flares observed by radio spectrometers in China and the Czech Republic at a. frequency of 0.80-7.60 GHz during 1994-2014. These type III pairs occurred in flare impulsive and postflare phases with separate frequencies. in the. range of 1.08-3.42 GHz and a. frequency gap of 10-1700 MHz. The frequency drift increases with the separate frequency (f(x)), the lifetime of each burst is anti-correlated to f(x), while the frequency gap is independent of f(x). In most events, the normal branches are drifting obviously faster than the RS branches. The type III pairs occurring in flare impulsive phase have lower separate frequencies, longer lifetimes, wider frequency gaps, and slower frequency drifts than that occurring in postflare phase. Also,. the latter always has strong circular polarization. Further analysis indicates that near the flare energy. release sites the plasma density is about 1010-1011 cm(-3) and the. temperature is. higher than 107 K. These results provide new constraints to the acceleration mechanism in solar flares.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: HARD X-RAY ; RADIO-BURSTS ; MAGNETIC RECONNECTION ; ELECTRON-BEAMS ; CHROMOSPHERIC EVAPORATION ; ENERGETIC ELECTRONS ; EMISSION ; CORONA ; ACCELERATION ; PULSATIONS
收录类别: SCI
项目资助者: NSFC(11273030 ; Astronomical Institute AS(RVO: 67985815) ; GA CR(P209/12/00103) ; (PIRSES-GA-295272-RADIOSUN) ; 11221063 ; 11373039 ; 11433006 ; 2014FY120300 ; CAS XDB09000000 ; ZDYZ2009-3)
语种: 英语
WOS记录号: WOS:000372303400042
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16174
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
2.Acad Sci Czech Republic, Astron Inst, CZ-25165 Ondrejov, Czech Republic
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
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