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IMF B-y-controlled field-aligned currents in the magnetotail during northward interplanetary magnetic field
Cheng, Z. W.; Shi, J. K.; Dunlop, M.; Liu, Z. X.; Cheng, ZW (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
2014
Volume115Pages:52-58
ISSN1364-6826
Language英语
KeywordField-aligned Currents Magnetotail Interplanetary Magnetic Field B-y
AbstractThe influence of the interplanetary magnetic field (IMF) B-y component on the field-aligned currents (FACs) in the plasma sheet boundary layer (PSBL) in the magnetotail during the northward IMF were investigated using the data from Cluster. There are 748 FACs cases selected to do analysis. We present that the IMF B-y component plays a very important role in controlling the flow direction of the FACs in the PSBL in the magnetotail. In the northern hemisphere, the influence of the positive (negative) IMF B-y is an earthward (tailward) FACs. To the contrary, in the southern hemisphere, the effect of the positive (negative) IMF B-y is a tailward (earthward) FACs. There is a clear north-south asymmetry of the polarity of the FACs in the PSBL when IMF B-y is positive or negative, and this asymmetry of the polarity is more distinct when IMF B-y is positive. The FAC density is controlled by IMF B-y only when vertical bar IMF B-y vertical bar is large. When vertical bar IMF B-y vertical bar is more than 10 nT the absolute FAC density in the PSBL has an obvious positive correlation with the vertical bar IMF B-y vertical bar. When vertical bar IMF B-y vertical bar is less than 10 nT, there is no correlation between the absolute FAC density and vertical bar IMF B-y vertical bar. There is a clear dusk-dawn asymmetry in the current densities for the FACs in the PSBL, with the dawn currents appearing larger than the dusk currents. The FAC with the largest (smallest) density is located in the range of 0100 <= MLT < 0200 (2100 <= MLT < 2200). (C) 2013 Elsevier Ltd. All rights reserved.
Indexed BySCI ; EI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4440
Collection空间科学部
Corresponding AuthorCheng, ZW (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Cheng, Z. W.,Shi, J. K.,Dunlop, M.,et al. IMF B-y-controlled field-aligned currents in the magnetotail during northward interplanetary magnetic field[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2014,115:52-58.
APA Cheng, Z. W.,Shi, J. K.,Dunlop, M.,Liu, Z. X.,&Cheng, ZW .(2014).IMF B-y-controlled field-aligned currents in the magnetotail during northward interplanetary magnetic field.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,115,52-58.
MLA Cheng, Z. W.,et al."IMF B-y-controlled field-aligned currents in the magnetotail during northward interplanetary magnetic field".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 115(2014):52-58.
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