DOI: 10.1002/2017JA024468
Scopus记录号: 2-s2.0-85040566619
论文题名: A Magnetohydrodynamic Modeling of the Interchange Cycle for Oblique Northward Interplanetary Magnetic Field
作者: Watanabe M. ; Fujita S. ; Tanaka T. ; Kubota Y. ; Shinagawa H. ; Murata K.T.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 272
结束页码: 286
语种: 英语
英文关键词: interchange cycle
; MHD simulation
; null-separator structure
英文摘要: We perform numerical modeling of the interchange cycle in the magnetosphere-ionosphere convection system for oblique northward interplanetary magnetic field (IMF). The interchange cycle results from the coupling of IMF-to-lobe reconnection and lobe-to-closed reconnection. Using a global magnetohydrodynamic simulation code, for an IMF clock angle of 20° (measured from due north), we successfully reproduced the following features of the interchange cycle. (1) In the ionosphere, for each hemisphere, there appears a reverse cell circulating exclusively in the closed field line region (the reciprocal cell). (2) The topology transition of the magnetic field along a streamline near the equatorial plane precisely represents the magnetic flux reciprocation during the interchange cycle. (3) Field-aligned electric fields on the interplanetary-open separatrix and on the open-closed separatrix are those that are consistent with IMF-to-lobe reconnection and lobe-to-closed reconnection, respectively. These three features prove the existence of the interchange cycle in the simulated magnetosphere-ionosphere system. We conclude that the interchange cycle does exist in the real solar wind-magnetosphere-ionosphere system. In addition, the simulation revealed that the reciprocal cell described above is not a direct projection of the diffusion region as predicted by the “vacuum” model in which diffusion is added a priori to the vacuum magnetic topology. Instead, the reciprocal cell is a consequence of the plasma convection system coupled to the so-called NBZ (“northward Bz”) field-aligned current system. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114726
Appears in Collections: 气候减缓与适应
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作者单位: International Center for Space Weather Science and Education, Kyushu University, Fukuoka, Japan; Also at Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka, Japan; Meteorological College, Kashiwa, Japan; Also at National Institute of Polar Research, Tachikawa, Japan; National Institute of Information and Communications Technology, Koganei, Japan
Recommended Citation:
Watanabe M.,Fujita S.,Tanaka T.,et al. A Magnetohydrodynamic Modeling of the Interchange Cycle for Oblique Northward Interplanetary Magnetic Field[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)