Estimating horizontal electric current in solar active regions

	Estimating horizontal electric current in solar active regions
	Ji, HS; Song, MT ; Li, XQ ; Hu, FM
刊名	SOLAR PHYSICS
	1998-10-01
卷号	182 期号:2 页码:365-379
关键词	FREE MAGNETIC-FIELDS FLARE PHENOMENA MORPHOLOGY NOAA-6659 VECTOR JUNE
ISSN号	0038-0938
英文摘要	Within the framework of nonlinear force-free field models, we have developed a relaxation scheme for estimating horizontal electric currents in solar active regions. The test case which uses an analytical solution shows that at each iteration step the average Lorentz force decreases rapidly and the values of partial derivative B-x/partial derivative z and partial derivative By/partial derivative z converge well toward analytical ones. As a result the computed horizontal electric currents and analytical ones show good agreement in both distribution and magnitude. This scheme has avoided mathematical singularities along the inversion line B-z = 0 which appeared in the previous extrapolating methods. Then this newly developed scheme is used to analyze the vector magnetogram of a Rare-prolific region NOAA 6659. The computational results show the following: (1) The distribution of horizontal electric current and vertical electric current share a similar configuration. (2) Near the separator of a quadrupole field configuration of this active region there is a confined region of strong horizontal electric currents, near which a white-light flare took place on the same day.
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]	FREE MAGNETIC-FIELDS ; FLARE PHENOMENA ; MORPHOLOGY ; NOAA-6659 ; VECTOR ; JUNE
收录类别	SCI
语种	英语
WOS记录号	WOS:000077322300006
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8352]
专题	中国科学院紫金山天文台
作者单位	1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Beijing Astron Observ, Huairou Solar Stn, Beijing 100080, Peoples R China 3.Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
推荐引用方式 GB/T 7714	Ji, HS,Song, MT,Li, XQ,et al. Estimating horizontal electric current in solar active regions[J]. SOLAR PHYSICS,1998,182(2):365-379.
APA	Ji, HS,Song, MT,Li, XQ,&Hu, FM.(1998).Estimating horizontal electric current in solar active regions.SOLAR PHYSICS,182(2),365-379.
MLA	Ji, HS,et al."Estimating horizontal electric current in solar active regions".SOLAR PHYSICS 182.2(1998):365-379.