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Effect of the solar wind conditions on the ionospheric equivalent current systems
Zhang, J. J.1,2; Wang, C.1; Tang, B. B.1; Li, H.1; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationANNALES GEOPHYSICAE
2013
Volume31Issue:3Pages:489-501
ISSN0992-7689
Language英语
KeywordIonosphere Electric Fields And Currents Modeling And Forecasting Magnetospheric Physics Solar Wind-magnetosphere Interactions
AbstractWe employ a global magnetohydrodynamics (MHD) model, namely the PPMLR-MHD model, to investigate the effect of the solar wind conditions, such as the interplanetary magnetic field (IMF) clock angle, southward IMF magnitude and solar wind speed, on the average pattern of the ionospheric equivalent current systems (ECS). A new method to derive ECS from the MHD model is proposed and applied, which takes account of the oblique magnetic field line effects. The model results indicate that when the IMF is due northward, the ECS are very weak while the current over polar region is stronger than the lower latitude; when the IMF rotates southward, the two-cell current system dominates, the eastward electrojet on the afternoon sector and the westward electrojet on the dawn sector increase rapidly while the westward electrojet is stronger than the eastward electrojet. Under southward IMF, the intensity of the westward electrojet and eastward electrojet both increase with the increase of the southward IMF magnitude and solar wind speed, and the increase is very sharp for the westward electrojet. Furthermore, we compare the geomagnetic perturbations on the ground represented by the simulated average ECS with the observation-based statistical results under similar solar wind conditions. It is found that the model results generally match with the observations, but the underestimation of the eastward equivalent current on the dusk sector is the main limitation of the present model.; We employ a global magnetohydrodynamics (MHD) model, namely the PPMLR-MHD model, to investigate the effect of the solar wind conditions, such as the interplanetary magnetic field (IMF) clock angle, southward IMF magnitude and solar wind speed, on the average pattern of the ionospheric equivalent current systems (ECS). A new method to derive ECS from the MHD model is proposed and applied, which takes account of the oblique magnetic field line effects. The model results indicate that when the IMF is due northward, the ECS are very weak while the current over polar region is stronger than the lower latitude; when the IMF rotates southward, the two-cell current system dominates, the eastward electrojet on the afternoon sector and the westward electrojet on the dawn sector increase rapidly while the westward electrojet is stronger than the eastward electrojet. Under southward IMF, the intensity of the westward electrojet and eastward electrojet both increase with the increase of the southward IMF magnitude and solar wind speed, and the increase is very sharp for the westward electrojet. Furthermore, we compare the geomagnetic perturbations on the ground represented by the simulated average ECS with the observation-based statistical results under similar solar wind conditions. It is found that the model results generally match with the observations, but the underestimation of the eastward equivalent current on the dusk sector is the main limitation of the present model.
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/122/1543
Collection空间科学部
Corresponding Author北京8701信箱
Affiliation1.Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, J. J.,Wang, C.,Tang, B. B.,et al. Effect of the solar wind conditions on the ionospheric equivalent current systems[J]. ANNALES GEOPHYSICAE,2013,31(3):489-501.
APA Zhang, J. J.,Wang, C.,Tang, B. B.,Li, H.,&北京8701信箱.(2013).Effect of the solar wind conditions on the ionospheric equivalent current systems.ANNALES GEOPHYSICAE,31(3),489-501.
MLA Zhang, J. J.,et al."Effect of the solar wind conditions on the ionospheric equivalent current systems".ANNALES GEOPHYSICAE 31.3(2013):489-501.
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