globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024681
Scopus记录号: 2-s2.0-85042105902
论文题名:
MMS Examination of FTEs at the Earth's Subsolar Magnetopause
作者: Akhavan-Tafti M.; Slavin J.A.; Le G.; Eastwood J.P.; Strangeway R.J.; Russell C.T.; Nakamura R.; Baumjohann W.; Torbert R.B.; Giles B.L.; Gershman D.J.; Burch J.L.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:2
起始页码: 1224
结束页码: 1241
语种: 英语
英文关键词: cluster ; coalescence ; flux transfer events ; force-free ; MMS ; subsolar magnetopause
英文摘要: Determining the magnetic field structure, electric currents, and plasma distributions within flux transfer event (FTE)-type flux ropes is critical to the understanding of their origin, evolution, and dynamics. Here the Magnetospheric Multiscale mission's high-resolution magnetic field and plasma measurements are used to identify FTEs in the vicinity of the subsolar magnetopause. The constant-α flux rope model is used to identify quasi-force free flux ropes and to infer the size, the core magnetic field strength, the magnetic flux content, and the spacecraft trajectories through these structures. Our statistical analysis determines a mean diameter of 1,700 ± 400 km (~30 ± 9 di) and an average magnetic flux content of 100 ± 30 kWb for the quasi-force free FTEs at the Earth's subsolar magnetopause which are smaller than values reported by Cluster at high latitudes. These observed nonlinear size and magnetic flux content distributions of FTEs appear consistent with the plasmoid instability theory, which relies on the merging of neighboring, small-scale FTEs to generate larger structures. The ratio of the perpendicular to parallel components of current density, RJ, indicates that our FTEs are magnetically force-free, defined as RJ < 1, in their core regions (<0.6 Rflux rope). Plasma density is shown to be larger in smaller, newly formed FTEs and dropping with increasing FTE size. It is also shown that parallel ion velocity dominates inside FTEs with largest plasma density. Field-aligned flow facilitates the evacuation of plasma inside newly formed FTEs, while their core magnetic field strengthens with increasing FTE size. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114574
Appears in Collections:气候减缓与适应

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作者单位: Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Imperial College London, London, United Kingdom; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Austrian Academy of Sciences, Graz, Austria; Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Southwest Research Institute, San Antonio, TX, United States; Department of Astronomy, University of Maryland, College Park, MD, United States

Recommended Citation:
Akhavan-Tafti M.,Slavin J.A.,Le G.,et al. MMS Examination of FTEs at the Earth's Subsolar Magnetopause[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)
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