globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024941
Scopus记录号: 2-s2.0-85044859199
论文题名:
Influence of the IMF Cone Angle on Invariant Latitudes of Polar Region Footprints of FACs in the Magnetotail: Cluster Observation
作者: Cheng Z.W.; Shi J.K.; Zhang J.C.; Torkar K.; Kistler L.M.; Dunlop M.; Carr C.; Rème H.; Dandouras I.; Fazakerley A.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:4
起始页码: 2588
结束页码: 2597
语种: 英语
英文关键词: FAC in magnetotail ; footprints in polar region ; IMF cone angle
英文摘要: The influence of the interplanetary magnetic field (IMF) cone angle θ (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°, 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/m2) cases are within invariant latitudes <71° and mainly within IMF cone angles θ > 60°, 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. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114109
Appears in Collections:气候减缓与适应

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作者单位: State Key Laboratory of Space Weather, NSSC/CAS, Beijing, China; Schools of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, China; Space Science Center, University of New Hampshire, Durham, NH, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Rutherford Appleton Laboratory, Chilton, Didcot, United Kingdom; Blackett Laboratory, Space and Atmospheric Physics Group, Imperial College, London, United Kingdom; University of Toulouse, UPS, IRAP, and CNRS, Toulouse, France; MSSL, University College London, Dorking, United Kingdom

Recommended Citation:
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,2018-01-01,123(4)
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