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Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation
Cheng, Z. W.; Shi, J. K.; Zhang, J. C.; Torkar, K.; Kistler, L. M.; Dunlop, M.; Carr, C.; Reme, H.; Dandouras, I.; Fazakerley, A.; Cheng, ZW (reprint author), NSSC CAS, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2018
Volume123Issue:4Pages:2588-2597
ISSN2169-9380
Language英语
KeywordFac In Magnetotail FootprInts In Polar Region Imf Cone Angle
AbstractThe influence of the interplanetary magnetic field (IMF) cone angle (the angle between the IMF direction and the Sun-Earth line) on the invariant latitudes of the footprints of the field-aligned currents (FACs) in the magnetotail has been investigated. We performed a statistical study of 542 FAC cases observed by the four Cluster spacecraft in the Northern Hemisphere. The results show that there are almost no FACs when the IMF cone angle is less than 10 degrees, and there are indications of the FACs in the plasma sheet boundary layers being weak under the radial IMF conditions. The footprints of the large FAC (> 10 nA/m(2)) cases are within invariant latitudes < 71 degrees and mainly within IMF cone angles theta > 60 degrees, which implies that the footprints of the large FACs mainly expand equatorward with large IMF cone angle. The equatorward boundary of the FAC footprints in the polar region decreases with increasing IMF cone angle (and has a better correlation for northward IMF), which shows that the IMF cone angle plays an important controlling role in FAC distributions in the magnetosphere-ionosphere coupling system. There is almost no correlation between the poleward boundary and the IMF cone angle for both northward and southward IMF. This is because the poleward boundary movement is limited by an enhanced lobe magnetic flux. This is the first time a correlation between FAC footprints in the polar region and IMF cone angles has been determined.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/6328
Collection空间科学部
Corresponding AuthorCheng, ZW (reprint author), NSSC CAS, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Cheng, Z. W.,Shi, J. K.,Zhang, J. C.,et al. Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(4):2588-2597.
APA Cheng, Z. W..,Shi, J. K..,Zhang, J. C..,Torkar, K..,Kistler, L. M..,...&Cheng, ZW .(2018).Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(4),2588-2597.
MLA Cheng, Z. W.,et al."Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.4(2018):2588-2597.
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