PMO OpenIR  > 太阳活动的多波段观测研究团组
Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst
Li, Jian-Ping1,2; Zhou, Ai-Hua1,2; Wang, Xin-Dong3
2016
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume16Issue:1
AbstractThe 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.
KeywordSun: Submillimeter Burst Sun: Energetic Electrons Sun: Radio Source Size
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/16/1/008
WOS KeywordHARD X-RAY ; SOLAR-FLARES ; NONTHERMAL ELECTRONS ; NONUNIFORM SOURCE ; MICROWAVE ; COMPONENT ; WAVELENGTHS ; FREQUENCY ; RANGE ; GHZ
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000368088700008
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16113
Collection太阳活动的多波段观测研究团组
Affiliation1.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
Recommended Citation
GB/T 7714
Li, Jian-Ping,Zhou, Ai-Hua,Wang, Xin-Dong. Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(1).
APA Li, Jian-Ping,Zhou, Ai-Hua,&Wang, Xin-Dong.(2016).Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(1).
MLA Li, Jian-Ping,et al."Study of temporal evolution of emission spectrum in a steeply rising submillimeter burst".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.1(2016).
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