DOI: 10.1002/2016GL070527
论文题名: Deep nightside photoelectron observations by MAVEN SWEA: Implications for Martian northern hemispheric magnetic topology and nightside ionosphere source
作者: Xu S. ; Mitchell D. ; Liemohn M. ; Dong C. ; Bougher S. ; Fillingim M. ; Lillis R. ; McFadden J. ; Mazelle C. ; Connerney J. ; Jakosky B.
刊名: Geophysical Research Letters
ISSN: 0094-8685
EISSN: 1944-8416
出版年: 2016
卷: 43, 期: 17 起始页码: 8876
结束页码: 8884
语种: 英语
英文关键词: magnetic topology
; Mars
; MAVEN
; nightside ionosphere
; photoelectrons
; weak crustal fields
Scopus关键词: Electron transport properties
; Ionosphere
; Ionospheric measurement
; Magnetic fields
; Magnetism
; Orbits
; Photoelectrons
; Photoionization
; Photons
; Solar system
; Topology
; Crustal fields
; Crustal magnetic fields
; Energy re distributions
; Interplanetary magnetic fields
; Magnetic topologies
; Mars
; MAVEN
; Superthermal electrons
; Magnetoplasma
; altitude
; connectivity
; electron
; instrumentation
; ionosphere
; magnetic field
; Martian atmosphere
; spacecraft
; topology
; zenith angle
英文摘要: The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission samples the Mars ionosphere down to altitudes of ∼150 km over a wide range of local times and solar zenith angles. On 5 January 2015 (Orbit 520) when the spacecraft was in darkness at high northern latitudes (solar zenith angle, SZA >120°; latitude >60°), the Solar Wind Electron Analyzer (SWEA) instrument observed photoelectrons at altitudes below 200 km. Such observations imply the presence of closed crustal magnetic field loops that cross the terminator and extend thousands of kilometers to the deep nightside. This occurs over the weak northern crustal magnetic source regions, where the magnetic field has been thought to be dominated by draped interplanetary magnetic fields (IMF). Such a day-night magnetic connectivity also provides a source of plasma and energy to the deep nightside. Simulations with the SuperThermal Electron Transport (STET) model show that photoelectron fluxes measured by SWEA precipitating onto the nightside atmosphere provide a source of ionization that can account for the O+ 2 density measured by the Suprathermal and Thermal Ion Composition (STATIC) instrument below 200 km. This finding indicates another channel for Martian energy redistribution to the deep nightside and consequently localized ionosphere patches and potentially aurora. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987608269&doi=10.1002%2f2016GL070527&partnerID=40&md5=2a4f6317b272db1a5af001f3a2b0aff9
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9648
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Space Sciences Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Xu S.,Mitchell D.,Liemohn M.,et al. Deep nightside photoelectron observations by MAVEN SWEA: Implications for Martian northern hemispheric magnetic topology and nightside ionosphere source[J]. Geophysical Research Letters,2016-01-01,43(17).