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题名: Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst
作者: Li JianPing(李建平)1, 2; Zhou, Ai-Hua1, 2; Wang, Xin-Dong3
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2016
卷号: 16, 期号:1
关键词: Sun: submillimeter burst ; Sun: energetic electrons ; Sun: radio source size
DOI: 10.1088/1674-4527/16/1/008
文章类型: Article
英文摘要: The temporal evolution of a spectrum during a steeply rising submillimeter (THz) burst that occurred on 2003 November 2 was investigated in detail for the first time. Observations show that the flux density of the THz spectrum increased steeply with frequency above 200 GHz. Their average rising rates reached a value of 235 sfu GHz(-1) (corresponding to spectral index alpha of 4.8) during the burst. The flux densities reached about 4 000 and 70 000 sfu at 212 and 405 GHz at the maximum phase, respectively. The emissions at 405 GHz maintained such a continuous high level that they largely exceeded the peak values of the microwave (MW) spectra during the main phase. Our studies suggest that only energetic electrons with a low-energy cutoff of similar to 1MeV and number density of similar to 10(6)-10(8) cm(-3) can produce such a strong and steeply rising THz component via gyrosynchrotron radiation based on numerical simulations of burst spectra in the case of a nonuniform magnetic field. The electron number density N, derived from our numerical fits to the THz temporal evolution spectra, increased substantially from 8 x 10(6) to 4 x 10(8) cm(-3), i.e., the N value increased 50 times during the rise phase. During the decay phase it decreased to 7 x 10(7) cm(-3), i.e., it decreased by about five times from the maximum phase. The total electron number decreased an order of magnitude from the maximum phase to the decay phase. Nevertheless, the variation in amplitude of N is only about one time in the MW emission source during this burst, and the total electron number did not decrease but increased by about 20% during the decay phase. Interestingly, we find that the THz source radius decreased by about 24% while the MW source radius, on the contrary, increased by 28% during the decay phase.
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 ; SOLAR-FLARES ; NONTHERMAL ELECTRONS ; NONUNIFORM SOURCE ; MICROWAVE ; COMPONENT ; WAVELENGTHS ; FREQUENCY ; RANGE ; GHZ
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11333009) ; National Basic Research Program of China (973 program)(2014CB744200)
语种: 英语
WOS记录号: WOS:000368088700008
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16113
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, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Hohai Univ, Sch Publ Adm, Nanjing 210098, Jiangsu, Peoples R China
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