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题名: Diagnostics from three rising submillimeter bursts
作者: Zhou, Ai-Hua1, 2; Li JianPing(李建平)1, 2; Wang, Xin-Dong3
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2016-02-01
卷号: 16, 期号:2
关键词: Sun: submillimeter emission ; Sun: energetic electrons ; Sun: radio source environment
DOI: 10.1088/1674-4527/16/2/031
文章类型: Article
英文摘要: In this paper we investigate three novel rising submillimeter (THz) bursts that occurred sequentially in Super Active Region NOAA 10486. The average rising rate of the flux density above 200 GHz is only 20 sfu GHz(-1) (corresponding to spectral index alpha of 1.6) for the THz spectral components of the 2003 October 28 and November 4 bursts, but it attained values of 235 sfu GHz(-1) (alpha = 4.8) in the 2003 November 2 burst. The steeply rising THz spectrum can be produced by a population of highly relativistic electrons with a low-energy cutoff of 1 MeV, but it only requires a low-energy cutoff of 30 keV for the two slowly rising THz bursts, via gyrosynchrotron (GS) radiation based on our numerical simulations of burst spectra in the magnetic dipole field case. The electron density variation is much larger in the THz source than in the microwave (MW) source. It is interesting that the THz source radius decreased by 20%-50 % during the decay phase for the three events, but the MW source increased by 28 % for the 2003 November 2 event. In the paper we will present a formula that can be used to calculate the energy released by ultrarel-ativistic electrons, taking the relativistic correction into account for the first time. We find that the energy released by energetic electrons in the THz source exceeds that in the MW source due to the strong GS radiation loss in the THz range, although the modeled THz source area is 3-4 orders smaller than the modeled MW source one. The total energies released by energetic electrons via the GS radiation in radio sources are estimated, respectively, to be 5.2 x 10(33), 3.9 x 10(33) and 3.7 x 10(32) erg for the October 28, November 2 and 4 bursts, which are 131, 76 and 4 times as large as the thermal energies of 2.9 x 10(31), 2.1 x 10(31) and 5.2 x 10(31) erg estimated from soft X-ray GOES observations.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SOLAR-FLARES ; SPECTRAL COMPONENT ; RADIO-EMISSION ; GAMMA-RAY ; MICROWAVE ; RANGE
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11333009 ; "973" program(2014CB744200) ; 11573072)
语种: 英语
WOS记录号: WOS:000369252500011
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16127
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Hohai Univ, Sch Publ Adm, Nanjing 210098, Jiangsu, Peoples R China
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