气候变化领域集成服务门户(CCPortal): Inverted-V Electron Acceleration Events Concurring With Localized Auroral Observations at Mars by MAVEN

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DOI	10.1029/2020GL087414
	Inverted-V Electron Acceleration Events Concurring With Localized Auroral Observations at Mars by MAVEN
	Xu S.; Mitchell D.L.; McFadden J.P.; Fillingim M.O.; Andersson L.; Brain D.A.; Weber T.; Schneider N.M.; Jain S.; Fowler C.M.; Lillis R.; Mazelle C.; Espley J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:9
英文摘要	From February to March 2019, the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft repeatedly observed aurora near periapsis over Mars' southern strong crustal fields. During these orbits, the Solar Wind Electron Analyzer observed accelerated electrons at similar locations to where the auroras were observed, resembling the inverted-V structure observed near Earth's auroral region. In this study, we present a case study of such an acceleration event, where we estimate a field-aligned electrostatic potential drop of ∼440 V. We determine the field-aligned current from the observed magnetic perturbation reaches 1.1 μA/m2, agreeing reasonably well with the estimated net electron current carried by acceleration electrons with a maximum of 2.5 μA/m2. Similar to Earth, the potential drop develops when the ambient plasma cannot sustain the imposed field-aligned current. We also estimate the potential layer to be located above 750- to 850-km altitude and the associated electric field to be ∼0.6 V/m. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Drops; Electric fields; Orbits; Accelerated electrons; Electron acceleration; Electron analyzer; Electron currents; Electrostatic potentials; Field aligned currents; Magnetic perturbation; Volatile evolution; Electrons; acceleration; aurora; electric field; electron; magnetic property; Mars; Martian atmosphere; observational method; planetary surface; plasma
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/170372
作者单位	Space Sciences Laboratory, University of California, Berkeley, CA, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; IRAP, CNRS-University of Toulouse-UPS-CNES, Toulouse, France; Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Xu S.,Mitchell D.L.,McFadden J.P.,et al. Inverted-V Electron Acceleration Events Concurring With Localized Auroral Observations at Mars by MAVEN[J],2020,47(9).
APA	Xu S..,Mitchell D.L..,McFadden J.P..,Fillingim M.O..,Andersson L..,...&Espley J..(2020).Inverted-V Electron Acceleration Events Concurring With Localized Auroral Observations at Mars by MAVEN.Geophysical Research Letters,47(9).
MLA	Xu S.,et al."Inverted-V Electron Acceleration Events Concurring With Localized Auroral Observations at Mars by MAVEN".Geophysical Research Letters 47.9(2020).