Dependence of anomalous resistivity on bulk drift velocity of electrons in the reconnecting current sheets in solar flares

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳活动的多波段观测研究团组

	Dependence of anomalous resistivity on bulk drift velocity of electrons in the reconnecting current sheets in solar flares
	Wu, Gui-Ping 1; Huang, Guang-Li 2; Ji, Hai-Sheng2
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2010-11-01
卷号	10 期号:11 页码:1186-1194
关键词	instabilities waves Sun: flares acceleration of particles
ISSN号	1674-4527
英文摘要	Anomalous resistivity is critical for triggering fast magnetic reconnection in the nearly collisionless coronal plasma. Its nonlinear dependence on bulk drift velocity is usually assumed in MHD simulations. However, the mechanism for the production of anomalous resistivity and its evolution is still an open question. We numerically solved the one dimension Vlasov equation with the typical solar coronal parameters and realistic mass ratios to infer the relationship between anomalous resistivity and bulk drift velocity of electrons in the reconnecting current sheets as well as its nonlinear characteristics. Our principal findings are summarized as follows: 1) the relationship between the anomalous resistivity and bulk drift velocity of electrons relative to ions may be described as eta(max) = 0.03724 (nu(d)/nu(e))(5.702) Omega m for nu(d)/nu(e) in the range of 1.4-2.0 and eta(max) = 0.8746 (nu(d)/nu(e))(1.284) Omega m for nu(d)/nu(e) in the range of 2.5-4.5; 2) if drift velocity is just slightly larger than the threshold of ion-acoustic instability, the anomalous resistivity due to the wave-particle interactions is enhanced by about five orders as compared with classic resistivity due to Coulomb collisions. With the increase of drift velocity from 1.4 nu(e), to 4.5 nu(e), the anomalous resistivity continues to increase 100 times; 3) in the rise phase of unstable waves, the anomalous resistivity has the same order as the one estimated from quasi-linear theory; after saturation of unstable waves, the anomalous resistivity decreases at least about one order as compared with its peak value; 4) considering that the final velocity of electrons ejected out of the reconnecting current sheet (RCS) decreases with the distance from the neutral point in the neutral plane, the anomalous resistivity decreases with the distance from the neutral point, which is favorable for the Petschek-like reconnection to take place.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	FAST MAGNETIC RECONNECTION ; ION-ACOUSTIC RESISTIVITY ; PARTICLE-ACCELERATION ; FIELD ; PLASMA ; DYNAMICS ; SIMULATIONS ; INSTABILITY ; COMPUTER ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000284495100009
公开日期	2011-11-23
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1233]
专题	紫金山天文台_太阳活动的多波段观测研究团组
作者单位	1.Southeast Univ, Dept Phys, Nanjing 210096, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Wu, Gui-Ping,Huang, Guang-Li,Ji, Hai-Sheng. Dependence of anomalous resistivity on bulk drift velocity of electrons in the reconnecting current sheets in solar flares[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(11):1186-1194.
APA	Wu, Gui-Ping,Huang, Guang-Li,&Ji, Hai-Sheng.(2010).Dependence of anomalous resistivity on bulk drift velocity of electrons in the reconnecting current sheets in solar flares.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(11),1186-1194.
MLA	Wu, Gui-Ping,et al."Dependence of anomalous resistivity on bulk drift velocity of electrons in the reconnecting current sheets in solar flares".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.11(2010):1186-1194.