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Fine Structures of Solar Radio Type III Bursts and Their Possible Relationship with Coronal Density Turbulence

文献类型：期刊论文

作者Chen, Xingyao2,3,4; Kontar, Eduard P.4; Yu, Sijie1; Yan, Yihua2,3; Huang, Jing2,3; Tan, Baolin2,3
刊名ASTROPHYSICAL JOURNAL
出版日期2018-03-20
卷号856期号:1页码:8
关键词solar wind Sun: corona Sun: radio radiation
ISSN号0004-637X
DOI10.3847/1538-4357/aaa9bf
英文摘要Solar radio type III bursts are believed to be the most sensitive signatures of near-relativistic electron beam propagation in the corona. A solar radio type IIIb-III pair burst with fine frequency structures, observed by the Low Frequency Array (LOFAR) with high temporal (similar to 10 ms) and spectral (12.5 kHz) resolutions at 30-80 MHz, is presented. The observations show that the type III burst consists of many striae, which have a frequency scale of about 0.1 MHz in both the fundamental (plasma) and the harmonic (double plasma) emission. We investigate the effects of background density fluctuations based on the observation of striae structure to estimate the density perturbation in the solar corona. It is found that the spectral index of the density fluctuation spectrum is about -1.7, and the characteristic spatial scale of the density perturbation is around 700 km. This spectral index is very close to a Kolmogorov turbulence spectral index of -5/3, consistent with a turbulent cascade. This fact indicates that the coronal turbulence may play the important role of modulating the time structures of solar radio type III bursts, and the fine structure of radio type III bursts could provide a useful and unique tool to diagnose the turbulence in the solar corona.
WOS关键词ELECTRON-BEAMS ; FREQUENCY ; EMISSION ; PLASMA ; SUN ; SPECTRUM ; DYNAMICS
资助项目NSFC[11433006] ; NSFC[11373039] ; NSFC[11573039] ; NSFC[11661161015] ; NSFC[11790301] ; Science and Technology Facilities Council (STFC) consolidated grant[ST/L000741/1] ; Marie Curie RadioSun project[PIRSES-GA-2011-295272] ; ISSI Bern, Switzerland
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000456422200001
出版者IOP PUBLISHING LTD
资助机构NSFC ; NSFC ; Science and Technology Facilities Council (STFC) consolidated grant ; Science and Technology Facilities Council (STFC) consolidated grant ; Marie Curie RadioSun project ; Marie Curie RadioSun project ; ISSI Bern, Switzerland ; ISSI Bern, Switzerland ; NSFC ; NSFC ; Science and Technology Facilities Council (STFC) consolidated grant ; Science and Technology Facilities Council (STFC) consolidated grant ; Marie Curie RadioSun project ; Marie Curie RadioSun project ; ISSI Bern, Switzerland ; ISSI Bern, Switzerland ; NSFC ; NSFC ; Science and Technology Facilities Council (STFC) consolidated grant ; Science and Technology Facilities Council (STFC) consolidated grant ; Marie Curie RadioSun project ; Marie Curie RadioSun project ; ISSI Bern, Switzerland ; ISSI Bern, Switzerland ; NSFC ; NSFC ; Science and Technology Facilities Council (STFC) consolidated grant ; Science and Technology Facilities Council (STFC) consolidated grant ; Marie Curie RadioSun project ; Marie Curie RadioSun project ; ISSI Bern, Switzerland ; ISSI Bern, Switzerland
源URL[http://ir.bao.ac.cn/handle/114a11/24342]  
专题中国科学院国家天文台
通讯作者Chen, Xingyao
作者单位1.New Jersey Inst Technol, 323 Martin Luther King Blvd, Newark, NJ 07102 USA
2.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
推荐引用方式
GB/T 7714		 Chen, Xingyao,Kontar, Eduard P.,Yu, Sijie,et al. Fine Structures of Solar Radio Type III Bursts and Their Possible Relationship with Coronal Density Turbulence[J]. ASTROPHYSICAL JOURNAL,2018,856(1):8.
APA Chen, Xingyao,Kontar, Eduard P.,Yu, Sijie,Yan, Yihua,Huang, Jing,&Tan, Baolin.(2018).Fine Structures of Solar Radio Type III Bursts and Their Possible Relationship with Coronal Density Turbulence.ASTROPHYSICAL JOURNAL,856(1),8.
MLA Chen, Xingyao,et al."Fine Structures of Solar Radio Type III Bursts and Their Possible Relationship with Coronal Density Turbulence".ASTROPHYSICAL JOURNAL 856.1(2018):8.

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