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Theoretical investigation of the onsets of type II radio bursts during solar eruptions
Lin J(林隽)1; Mancuso, S2; Vourlidas, A3; Lin, J (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ China, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2006-10-01
卷号649期号:2页码:1110-1123
DOI10.1086/506599
产权排序第1完成单位
收录类别SCI
关键词Sun : Coronal Mass Ejections (Cmes) Sun : Flares Sun : Magnetic Fields Sun : Radio Radiation
摘要On the basis of previous works, we investigated coronal mass ejection (CME) propagations and the consequent type II radio bursts invoked by the CME-driven shocks. The results indicate that the onset of type II bursts depends on the local Alfven speed (or the magnetoacoustic wave speed in the non-force-free environment), which is governed by both the magnetic field and the plasma density. This determines that the type II burst cannot appear at any altitude. Instead, its onset positions can never be lower than a critical height for the given coronal environment, which consequently determines the start frequencies of the emission: for an eruption taking place in the magnetic configuration with a background field of 100 G, the onset of type II bursts should occur at around 0.5 R(circle dot) from the solar surface, and the corresponding start frequency of the fundamental component is about 150 MHz. This result is consistent with similar estimates based on observations that bring the corresponding frequency to a few hundred MHz. Our results further indicate that the onset of type II bursts depends on the rate of magnetic reconnection as well. When magnetic reconnection during the eruption is not fast enough, a type II burst may not occur at all even if the associated CME is fast ( say, faster than 800 km s(-1)). This may account for the fast and radio-quiet CMEs. Related to these results, properties of the associated solar flares and type III radio bursts, especially those used as the precursors of the type II radio bursts, are also discussed.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2006-10-09
WOS记录号WOS:000240854200050
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; RECONNECTING CURRENT SHEETS ; RAY FLARE EMISSION ; MAGNETIC RECONNECTION ; FLUX-ROPE ; CHROMOSPHERIC EVAPORATION ; PARTICLE-ACCELERATION ; HEATING MECHANISMS ; LIGHT CURVES ; SHOCK-WAVES
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被引频次:44[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6086
专题太阳物理研究组
通讯作者Lin, J (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ China, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.National Astronomical Observatories of China/Yunnan Astronomical Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China; and Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
2.INAF/Osservatorio Astronomico di Torino, 20 Strada Osservatorio, I-10025 Pino Torinese, Italy
3.Solar Physics Branch, Naval Research Laboratory, 4555 Overlook Avenue, SW, Washington, DC 20375
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Lin J,Mancuso, S,Vourlidas, A,et al. Theoretical investigation of the onsets of type II radio bursts during solar eruptions[J]. ASTROPHYSICAL JOURNAL,2006,649(2):1110-1123.
APA Lin J,Mancuso, S,Vourlidas, A,&Lin, J .(2006).Theoretical investigation of the onsets of type II radio bursts during solar eruptions.ASTROPHYSICAL JOURNAL,649(2),1110-1123.
MLA Lin J,et al."Theoretical investigation of the onsets of type II radio bursts during solar eruptions".ASTROPHYSICAL JOURNAL 649.2(2006):1110-1123.
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