DOI: 10.1002/2018JA025186
Scopus记录号: 2-s2.0-85046282754
论文题名: How the IMF By Induces a Local By Component During Northward IMF Bz and Characteristic Timescales
作者: Tenfjord P. ; Østgaard N. ; Haaland S. ; Snekvik K. ; Laundal K.M. ; Reistad J.P. ; Strangeway R. ; Milan S.E. ; Hesse M. ; Ohma A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 3333
结束页码: 3348
语种: 英语
英文摘要: We use the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) By component on the coupling between the solar wind and magnetosphere-ionosphere system when IMF Bz>0. We describe the evolution of how a magnetospheric By component is induced on closed field lines during these conditions. Starting from dayside lobe reconnection, the magnetic tension on newly reconnected field lines redistribute the open flux asymmetrically between the two hemispheres. This results in asymmetric magnetic energy density in the lobes. Shear flows are induced to restore equilibrium, and these flows are what effectively induces a local By component. We show the radial dependence of the induced By and compare the results to the induced By during southward IMF conditions. We also show the response and reconfiguration time of the inner magnetosphere to IMF By reversals during northward IMF Bz. A superposed epoch analysis of magnetic field measurements from seven Geostationary Operational Environmental Satellite spacecraft at different local times both for negative-to-positive and positive-to-negative IMF By reversals is presented. We find that the induced By responds within 16 min of the arrival of IMF By at the bow shock, and it completely reconfigures within 47 min. ©2018. The authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114002
Appears in Collections: 气候减缓与适应
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作者单位: Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway; Max Planck Institute for Solar System Research, Göttingen, Germany; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, United States; Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Recommended Citation:
Tenfjord P.,Østgaard N.,Haaland S.,et al. How the IMF By Induces a Local By Component During Northward IMF Bz and Characteristic Timescales[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)