PMO OpenIR  > 太阳活动的多波段观测研究团组
Current-sheet buildup and magnetic reconnection in weakly ionized solar lower atmosphere
Ji, HS; Song, MT; Li, XQ
2001
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume198Issue:1Pages:133-148
AbstractSolar observations show that magnetic reconnection can occur in the Sun's weakly ionized lower atmosphere (magnetic cancellation, Ellerman bombs and type II white-light flares). Unlike what the usual reconnection models have predicted, such a reconnection is accompanied by temperature enhancements which are less than 10%. To overcome this difficulty, we have reexamined the reconnection in a two-fluid model using a 2D numerical simulation. The numerical solutions demonstrate the following results: (1) Under the influence of Lorentz force, ionized gas carries the magnetic field into a diffusion region where part of the field is annihilated, and the current-sheet scaling laws for the weakly ionized plasma are basically the same as in the fully ionized case. (2) Though the neutral gas is not directly affected by the magnetic field due to frictional forces, its motion is almost the same as the ionized gas except in the region near stagnation point where the streamlines of both species differ appreciably. (3) The pressure of neutrals which governs the distribution of total pressure and temperature varies slightly. So the temperature of the whole domain is nearly uniform in space and constant in time. These results support the idea that magnetic cancellation, Ellerman bombs, and type II white-light flares are due to magnetic reconnection in the Sun's lower atmosphere.
KeywordAmbipolar Diffusion Interstellar-medium Active Region Quiet Sun Cancellation Flux Flares
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordAMBIPOLAR DIFFUSION ; INTERSTELLAR-MEDIUM ; ACTIVE REGION ; QUIET SUN ; CANCELLATION ; FLUX ; FLARES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000166870200007
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8219
Collection太阳活动的多波段观测研究团组
Affiliation1.Purple Mt Observ, Nanjing 210008, Peoples R China
2.Natl Astron Observ, Beijing 100080, Peoples R China
3.Nanjing Normal Univ, Dept Phys, Nanjing 210087, Peoples R China
Recommended Citation
GB/T 7714
Ji, HS,Song, MT,Li, XQ. Current-sheet buildup and magnetic reconnection in weakly ionized solar lower atmosphere[J]. SOLAR PHYSICS,2001,198(1):133-148.
APA Ji, HS,Song, MT,&Li, XQ.(2001).Current-sheet buildup and magnetic reconnection in weakly ionized solar lower atmosphere.SOLAR PHYSICS,198(1),133-148.
MLA Ji, HS,et al."Current-sheet buildup and magnetic reconnection in weakly ionized solar lower atmosphere".SOLAR PHYSICS 198.1(2001):133-148.
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