DOI: 10.1002/2013GL059130
论文题名: Electrodynamics of the Martian dynamo region near magnetic cusps and loops
作者: Riousset J.A. ; Paty C.S. ; Lillis R.J. ; Fillingim M.O. ; England S.L. ; Withers P.G. ; Hale J.P.M.
刊名: Geophysical Research Letters
ISSN: 0094-10354
EISSN: 1944-10085
出版年: 2014
卷: 41, 期: 4 起始页码: 1119
结束页码: 1125
语种: 英语
英文关键词: atmospheric dynamo
; dynamo current
; Mars
; multifluid MHD
; numerical model
; plasma
Scopus关键词: Charge carriers
; Electric fields
; Electrodynamics
; Electromagnetism
; Interactive devices
; Ionosphere
; Magnetohydrodynamics
; Numerical models
; Plasmas
; Topology
; Atmospheric electrodynamics
; Atmospheric escape
; Crustal magnetic fields
; Dynamo currents
; Magnetic topologies
; Mars
; Multi-fluids
; Remanent magnetization
; Electric generators
; collision
; electromagnetic method
; ionosphere
; magnetic property
; magnetization
; Mars
; Martian atmosphere
; particulate matter
; solar system
; topology
英文摘要: Strong and inhomogeneous remanent magnetization on Mars results in a complex pattern of crustal magnetic fields. The geometry and topology of these fields lead to atmospheric electrodynamic structures that are unique among the bodies of the solar system. In the atmospheric dynamo region (∼100-250 km altitude), ions depart from the gyropath due to collisions with neutral particles, while electron motion remains governed by electromagnetic drift. This differential motion of the charge carriers generates electric currents, which induce a perturbation field. The electromagnetic changes ultimately alter the behavior of the local ionosphere beyond the dynamo region. Here we use multifluid modeling to investigate the dynamics around an isolated magnetic cusp and around magnetic loops or arcades representative of the magnetic topology near, for example, Terra Sirenum. Our results show consistent, circular patterns in the electric current around regions with high local field strength, with possible consequences on atmospheric escape of charged particles. Key Points The dynamo current forms in a torus shape due to the E→×B→ drift of electrons Asymmetries in the electric field are due to the collision-driven ion dynamics Magnetized region can alter charge carrier motion from lower to upper atmosphere ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894243950&doi=10.1002%2f2013GL059130&partnerID=40&md5=b2797e438b219606379e4194943c8bc6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7618
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta GA, United States
Recommended Citation:
Riousset J.A.,Paty C.S.,Lillis R.J.,et al. Electrodynamics of the Martian dynamo region near magnetic cusps and loops[J]. Geophysical Research Letters,2014-01-01,41(4).