DOI: 10.1002/2017JA024884
Scopus记录号: 2-s2.0-85044095576
论文题名: Oxygen Ion Energization at Mars: Comparison of MAVEN and Mars Express Observations to Global Hybrid Simulation
作者: Jarvinen R. ; Brain D.A. ; Modolo R. ; Fedorov A. ; Holmström M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 2 起始页码: 1678
结束页码: 1689
语种: 英语
英文关键词: induced magnetosphere
; ion energization
; ion escape
; Mars
; plume
; solar wind
英文摘要: We study oxygen ion energization in the Mars-solar wind interaction by comparing particle and magnetic field observations on the Mars Atmosphere and Volatile EvolutioN (MAVEN) and Mars Express missions to a global hybrid simulation. We find that large-scale structures of the Martian-induced magnetosphere and plasma environment as well as the Mars heavy ion plume as seen by multispacecraft observations are reproduced by the model. Using the simulation, we estimate the dynamics of escaping oxygen ions by analyzing their distance and time of flight as a function of the gained kinetic energy along spacecraft trajectories. In the upstream region the heavy ion energization resembles single-particle solar wind ion pickup acceleration as expected, while within the induced magnetosphere the energization displays other features including the heavy ion plume from the ionosphere. Oxygen ions take up to 80 s and travel the distance of 20,000 km after their emission from the ionosphere to the induced magnetosphere or photoionization from the neutral exosphere before they have reached energies of 10 keV in the plume along the analyzed spacecraft orbits. Lower oxygen ion energies of 100 eV are reached faster in 10–20 s over the distance of 100–200 km in the plume. Our finding suggests that oxygen ions are typically observed within the first half of their gyrophase if the spacecraft periapsis is on the hemisphere where the solar wind convection electric field points away from Mars. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114540
Appears in Collections: 气候减缓与适应
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作者单位: Finnish Meteorological Institute, Helsinki, Finland; Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Espoo, Finland; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; LATMOS/IPSL, UVSQ Université Paris-Saclay, UPMC University Paris CNRS, Guyancourt, France; Université de Toulouse, UPS-OMP, IRAP, Toulouse, France; Swedish Institute of Space Physics, Kiruna, Sweden
Recommended Citation:
Jarvinen R.,Brain D.A.,Modolo R.,et al. Oxygen Ion Energization at Mars: Comparison of MAVEN and Mars Express Observations to Global Hybrid Simulation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(2)