气候变化领域集成服务门户(CCPortal): Identifying Active Kelvin–Helmholtz Vortices on Saturn's Magnetopause Boundary

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DOI	10.1029/2019GL084206
	Identifying Active Kelvin–Helmholtz Vortices on Saturn's Magnetopause Boundary
	Burkholder B.L.; Delamere P.A.; Johnson J.R.; Ng C.-S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	For ̴ 2, 000 Cassini magnetopause encounters, we analyse plasma and magnetic fields. The boundary can be unstable to the Kelvin–Helmholtz instability (KHI), which can drive large-scale flows identifiable in plasma measurements. Bulk flow reversed from the expected direction near the magnetopause can indicate vorticity associated with active KH, and events are found dominantly in the dawn–subsolar region. KHIs are also responsible for magnetic field fluctuations, and hybrid simulations indicate heating, and transport is significant in an actively growing vortex. Cassini observations are filtered for disturbed magnetic fields near the magnetopause, similar to the signatures from hybrid simulations, with significant fluctuation and current sheet crossings. We also find that these occur most frequently in the dawn–subsolar region. A turbulent heating rate density and mass diffusion coefficient are calculated for these disturbed events and compared with the hybrid simulation to test whether enhanced values for these quantities can identify active KH events. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Magnetic fields; Magnetopause; Planets; Plasma diagnostics; Plasma stability; Vortex flow; Cassini; Diffusive transport; Hybrid simulation; Kelvin- helmholtz instabilities; Turbulent heating; Magnetoplasma; diffusivity; heating; instability; magnetic field; magnetopause; plasma; satellite; Saturn; turbulence; vorticity
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170858
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Engineering and Computer Science, Andrews University, Berrien Springs, MI, United States
推荐引用方式 GB/T 7714	Burkholder B.L.,Delamere P.A.,Johnson J.R.,等. Identifying Active Kelvin–Helmholtz Vortices on Saturn's Magnetopause Boundary[J],2020,47(1).
APA	Burkholder B.L.,Delamere P.A.,Johnson J.R.,&Ng C.-S..(2020).Identifying Active Kelvin–Helmholtz Vortices on Saturn's Magnetopause Boundary.Geophysical Research Letters,47(1).
MLA	Burkholder B.L.,et al."Identifying Active Kelvin–Helmholtz Vortices on Saturn's Magnetopause Boundary".Geophysical Research Letters 47.1(2020).