Theoretical investigation of the onsets of type II radio bursts during solar eruptions

doi:10.1086/506599

YNAO OpenIR > 太阳物理研究组

	Theoretical investigation of the onsets of type II radio bursts during solar eruptions
	Lin J(林隽)1 ; Mancuso, S 2; Vourlidas, A 3; 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
DOI	10.1086/506599
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
ISSN	0004-637X
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
引用统计	被引频次：53[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
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	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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