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Bow shock and magnetopause contributions to the cross-tail current from global MHD simulations
Tang, B. B.; Guo, X. C.; Wang, C.; Hu, Y. Q.; Kan, J. R.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Space Physics
2009
Volume114Pages:A08203
ISSN0148-0227
Language英语
KeywordInterplanetary Magnetic-field Solar-wind Current Systems Magnetosphere Generation Closure
AbstractWe performed a series of global MHD simulations to study the closure of the cross-tail current in the magnetotail under different solar wind conditions. The cross-tail current closes totally within the magnetopause, forming the classical theta structure when IMF is set to be zero. The situation changes for southward IMF cases: part of the cross-tail current passes through the magnetosheath and closes across the bow shock, forming an overlapped q structure of the cross-tail current, when viewed from the Sun. Quantitative analysis shows that a larger strength of the southward IMF B-Z results in a higher percentage of current closed through the bow shock. Nearly a constant quantity of the cross-tail current comes from the bow shock despite variations in the solar wind speed. An increase in the ionospheric Pedersen conductance leads to an increase in the bow shock contribution but a decrease in the magnetopause contribution to the cross-tail current; therefore, the net cross-tail current is almost independent of the ionospheric conductance. Cross-tail current that closes across the bow shock rather than the magnetopause can be classified as the magnetic reconnection current, providing energy supply for dissipation needed at the magnetic reconnection region in the magnetotail.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1148
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Tang, B. B.,Guo, X. C.,Wang, C.,et al. Bow shock and magnetopause contributions to the cross-tail current from global MHD simulations[J]. Journal of Geophysical Research-Space Physics,2009,114:A08203.
APA Tang, B. B.,Guo, X. C.,Wang, C.,Hu, Y. Q.,Kan, J. R.,&北京8701信箱.(2009).Bow shock and magnetopause contributions to the cross-tail current from global MHD simulations.Journal of Geophysical Research-Space Physics,114,A08203.
MLA Tang, B. B.,et al."Bow shock and magnetopause contributions to the cross-tail current from global MHD simulations".Journal of Geophysical Research-Space Physics 114(2009):A08203.
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