PMO OpenIR  > 太阳高能及相关物理过程研究团组
An electron density model above the sunspot from a mapping of NOAA 7260 at 17 GHz
Yu, XF; Yao, JX
2002-06-01
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
Volume2Issue:3Pages:287-292
AbstractThe brightness temperature distribution of microwave emission in a solar active region generally shows a ring structure, with a dip at the centre. However, no dip was found in the Nobeyama Radioheliograph left handed circular polarization (LCP) image on 1992 August 18; instead, there was a peak. This is a completely LCP source with zero right-handed circular polarization (RCP). We examine this structure in terms of the joint effect of gyroresonance and bremsstrahlung mechanism with a raised electron density above the central part of the sunspot, and the commonly assumed temperature and vertical dipole magnetic field models. The raised electron density is found to be 1.4 x 10(11) cm(-3) at the chromosphere base.
KeywordSun : Activity Sunspots Sun : Radio Radiation Sun : Chromosphere
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000176574900010
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7923
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Yu, XF,Yao, JX. An electron density model above the sunspot from a mapping of NOAA 7260 at 17 GHz[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2002,2(3):287-292.
APA Yu, XF,&Yao, JX.(2002).An electron density model above the sunspot from a mapping of NOAA 7260 at 17 GHz.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2(3),287-292.
MLA Yu, XF,et al."An electron density model above the sunspot from a mapping of NOAA 7260 at 17 GHz".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 2.3(2002):287-292.
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