气候变化领域集成服务门户(CCPortal): Ballooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation

CCPortal

DOI	10.1029/2020GL088227
	Ballooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation
	Sorathia K.A.; Merkin V.G.; Panov E.V.; Zhang B.; Lyon J.G.; Garretson J.; Ukhorskiy A.Y.; Ohtani S.; Sitnov M.; Wiltberger M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Explosive magnetotail activity has long been understood in the context of its auroral manifestations. While global models have been used to interpret and understand many magnetospheric processes, the temporal and spatial scales of some auroral forms have been inaccessible to global modeling creating a gulf between observational and theoretical studies of these phenomena. We present here an important step toward bridging this gulf using a newly developed global magnetosphere-ionosphere model with resolution capturing (Formula presented.) 30 km azimuthal scales in the auroral zone. In a global magnetohydrodynamic (MHD) simulation of the growth phase of a synthetic substorm, we find the self-consistent formation and destabilization of localized magnetic field minima in the near-Earth magnetotail. We demonstrate that this destabilization is due to ballooning-interchange instability which drives earthward entropy bubbles with embedded magnetic fronts. Finally, we show that these bubbles create localized field-aligned current structures that manifest in the ionosphere with properties matching observed auroral beads. ©2020. The Authors.
英文关键词	Ionosphere; Ionospheric measurement; Magnetoplasma; Magnetosphere; Plasma diagnostics; Plasma sheaths; Plasma stability; Interchange instability; Ionosphere modeling; Magnetohydrodynamic simulations; Magnetospheric process; Near-Earth magnetotail; Near-Earth plasmas; Temporal and spatial scale; Theoretical study; Magnetohydrodynamics; aurora; ionosphere; magnetic field; magnetosphere; magnetotail; spatiotemporal analysis
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/170102
作者单位	The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Department of Earth Sciences, University of Hong Kong, Hong Kong; Department of Physics and Astronomy, Dartmouth College, Hanover, NH, United States; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Sorathia K.A.,Merkin V.G.,Panov E.V.,et al. Ballooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation[J],2020,47(14).
APA	Sorathia K.A..,Merkin V.G..,Panov E.V..,Zhang B..,Lyon J.G..,...&Wiltberger M..(2020).Ballooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation.Geophysical Research Letters,47(14).
MLA	Sorathia K.A.,et al."Ballooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation".Geophysical Research Letters 47.14(2020).