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Quasi-periodic reversals of radio polarization at 17 GHz observed in the 2002 April 21 solar event
Huang, GL1; Lin J(林隽)2,3; Huang, GL (reprint author), Chinese Acad Sci, Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2006-03-10
Volume639Issue:2Pages:L99-L102
DOI10.1086/502971
Contribution Rank第2完成单位
Indexed BySCI
KeywordPolarization Sun : Activity Sun : Radio Radiation
AbstractWe investigate high spatial resolution radio polarization data obtained by the Nobeyama Radioheliograph (NoRH) and high time resolution data observed with the Nobeyama Radio Polarimeters (NoRP) during the well-studied flare/CME event of 2002 April 21. A 17 GHz radio source at the loop top was seen by NoRH to move upward together with the expanding flare loops at a speed of around 10 km s(-1). In the 5 minutes before the source began its upward motion, the Stokes V of the radio signals at 17 GHz showed quasi-periodic reversals between left-circular polarization (LCP) and right-circular polarization (RCP). Following this interval, the polarizations gradually turned to LCP. During this period, the polarization of the corresponding footpoint source maintained the RCP sense. The reversal of Stokes V between RCP and LCP was also detected at lower frequencies (1-2 GHz) by NoRP, without spatial resolution. The observed reversals between RCP and LCP of the radio signals from the top of the flare loop system can be taken as evidence that magnetic energy is released or energetic particles are produced at the magnetic reconnection site in a quasi-periodic fashion.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
WOS IDWOS:000235837200014
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MASS EJECTION ; NOBEYAMA RADIOHELIOGRAPH ; MAGNETIC-FIELD ; X1.5 FLARE ; RHESSI ; RECONNECTION ; MICROWAVE ; BURSTS ; EMISSION ; TRACE
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Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6093
Collection太阳物理研究组
Corresponding AuthorHuang, GL (reprint author), Chinese Acad Sci, Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Peoples R China.
Affiliation1.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, 210008 Nanjing, China
2.Yunnan Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
Recommended Citation
GB/T 7714
Huang, GL,Lin J,Huang, GL . Quasi-periodic reversals of radio polarization at 17 GHz observed in the 2002 April 21 solar event[J]. ASTROPHYSICAL JOURNAL,2006,639(2):L99-L102.
APA Huang, GL,Lin J,&Huang, GL .(2006).Quasi-periodic reversals of radio polarization at 17 GHz observed in the 2002 April 21 solar event.ASTROPHYSICAL JOURNAL,639(2),L99-L102.
MLA Huang, GL,et al."Quasi-periodic reversals of radio polarization at 17 GHz observed in the 2002 April 21 solar event".ASTROPHYSICAL JOURNAL 639.2(2006):L99-L102.
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