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PMO OpenIR  > 太阳活动的多波段观测研究团组  > 期刊论文
题名: MICROWAVE IMAGING OF A HOT FLUX ROPE STRUCTURE DURING THE PRE-IMPULSIVE STAGE OF AN ERUPTIVE M7.7 SOLAR FLARE
作者: Wu, Zhao1; Chen, Yao1; Huang, Guangli2; Nakajima, Hiroshi3; Song, Hongqiang1; Melnikov, Victor4; Liu, Wei5; Li, Gang6, 7; Chandrashekhar, Kalugodu1; Jiao, Fangran1
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2016-04-01
卷号: 820, 期号:2
关键词: magnetic reconnection ; Sun: corona ; Sun: flares ; Sun: radio radiation
DOI: 10.3847/2041-8205/820/2/L29
文章类型: Article
英文摘要: Corona structures and processes during the pre-impulsive stage of solar eruption are crucial to understanding the physics leading to the subsequent explosive energy release. Here we present the first microwave imaging study of a hot flux rope structure during the pre-impulsive stage of an eruptive M7.7 solar flare, with the Nobeyama Radioheliograph at 17 GHz. The flux rope is also observed by the SDO/AIA in its hot passbands of 94 and 131 angstrom. In the microwave data, it is revealed as an overall arcade-like structure consisting of several intensity enhancements bridged by generally weak emissions, with brightness temperatures (T-B) varying from similar to 10,000 K to similar to 20,000 K. Locations of microwave intensity enhancements along the structure remain relatively fixed at certain specific parts of the flux rope, indicating that the distribution of emitting electrons is affected by the large-scale magnetic configuration of the twisted flux rope. Wavelet analysis shows a pronounced 2 minute period of the microwave TB variation during the pre-impulsive stage of interest. The period agrees well with that reported for AIA sunward-contracting loops and upward ejective plasmoids (suggested to be reconnection outflows). This suggests that both periodicities are controlled by the same reconnection process that takes place intermittently at a 2 minute timescale. We infer that at least a part of the emission is excited by non-thermal energetic electrons via the gyro-synchrotron mechanism. The study demonstrates the potential of microwave imaging in exploring the flux rope magnetic geometry and relevant reconnection process during the onset of solar eruption.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: CORONAL MASS EJECTIONS ; EMISSION MEASURE ANALYSIS ; MAGNETIC RECONNECTION ; PLASMOID EJECTIONS ; RADIO ; ACCELERATION ; OSCILLATIONS ; SDO/AIA
收录类别: SCI
项目资助者: NSBRSF(2012CB825601) ; NNSFC(41274175 ; NSF(ATM-0847719 ; 41331068) ; AGS1135432)
语种: 英语
WOS记录号: WOS:000373085300007
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16179
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.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Natl Inst Nat Sci, Natl Astron Observ Japan, Nobeyama Radio Observ, Minamisa Ku, 462-2 Nobeyama, Minamimaki, Nagano 3841305, Japan
4.Russian Acad Sci, Cent Astron Observ Pulkovo, St Petersburg 196140, Russia
5.Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
6.Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USA
7.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
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