气候变化领域集成服务门户(CCPortal): Particle-In-Cell Modeling of Martian Magnetic Cusps and Their Role in Enhancing Nightside Ionospheric Ion Escape

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DOI	10.1029/2020GL090763
	Particle-In-Cell Modeling of Martian Magnetic Cusps and Their Role in Enhancing Nightside Ionospheric Ion Escape
	Poppe A.R.; Brain D.A.; Dong Y.; Xu S.; Jarvinen R.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:1
英文摘要	Amongst various escape channels, ion outflow is a major contributor to atmospheric loss at Mars over geologic time. On Mars' nightside, observations have indicated that cusp regions within crustal magnetic fields are associated with phenomena such as accelerated particle populations, discrete auroral emissions, and ionospheric outflow; however, the kinetic physics occurring within crustal magnetic cusps is poorly understood. Here, we present 1.5-dimensional particle-in-cell simulations of magnetospheric-ionospheric interactions within martian crustal magnetic cusp regions of varying strength. Simulation results demonstrate the formation of quasi-static, field-aligned potentials pointing away from Mars that accelerate electrons into the martian atmosphere while accelerating ions away, thereby enhancing ionospheric escape. Escaping ionospheric flux scales with crustal field strength, with 160 nT crustal fields yielding >2× the ion escape flux than in the case with no crustal fields. We discuss these results and conclude that magnetic cusp regions may be significant sources of ion loss at Mars. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ions; Magnetosphere; Accelerated particles; Auroral emission; Crustal magnetic fields; Ionospheric flux; Magnetic cusps; Martian atmospheres; Particle-in-cell model; Particle-in-cell simulations; Magnetism
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/169266
作者单位	Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, United States; Department of Astrophysical and Planetary Sciences, University of Colorado at Boulder, Boulder, CO, United States; Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, CO, United States; Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Espoo, Finland; Finnish Meteorological InstituteHelsinki, Finland
推荐引用方式 GB/T 7714	Poppe A.R.,Brain D.A.,Dong Y.,et al. Particle-In-Cell Modeling of Martian Magnetic Cusps and Their Role in Enhancing Nightside Ionospheric Ion Escape[J],2021,48(1).
APA	Poppe A.R.,Brain D.A.,Dong Y.,Xu S.,&Jarvinen R..(2021).Particle-In-Cell Modeling of Martian Magnetic Cusps and Their Role in Enhancing Nightside Ionospheric Ion Escape.Geophysical Research Letters,48(1).
MLA	Poppe A.R.,et al."Particle-In-Cell Modeling of Martian Magnetic Cusps and Their Role in Enhancing Nightside Ionospheric Ion Escape".Geophysical Research Letters 48.1(2021).