DOI: 10.1002/2016GL070248
论文题名: Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements
作者: Juusola L. ; Archer W.E. ; Kauristie K. ; Burchill J.K. ; Vanhamäki H. ; Aikio A.T.
刊名: Geophysical Research Letters
ISSN: 0094-8398
EISSN: 1944-8129
出版年: 2016
卷: 43, 期: 22 起始页码: 11519
结束页码: 11527
语种: 英语
英文关键词: auroral arc
; ionospheric conductances
; ionospheric electrodynamics
; Spherical Elementary Current Systems
; Swarm
Scopus关键词: Electric field measurement
; Electric fields
; Electrodynamics
; Auroral arcs
; Electric and magnetic field measurements
; Field aligned currents
; Ionospheric conductance
; Magnetic and electric fields
; Peak current density
; Swarm
; Electric variables measurement
英文摘要: We show the first ionospheric Hall and Pedersen conductances derived from Swarm magnetic and electric field measurements during a crossing of a morning sector auroral arc. Only Swarm-A was used, with assumptions of negligible azimuthal gradients and vanishing eastward electric field. We find upward field-aligned current, enhanced Hall and Pedersen conductances, and relatively weak electric field coincident with the arc. Poleward of the arc, the field-aligned current was downward, conductances lower, and the electric field enhanced. The arc was embedded in a westward electrojet, immediately equatorward of the peak current density. The equatorward portion of the electrojet could thus be considered conductance dominant and the poleward portion electric field dominant. Although the electric field measured by Swarm was intense, resulting in conductances lower than those typically reported, comparable electric fields have been observed earlier. These results demonstrate how Swarm data can significantly contribute to our understanding of the ionospheric electrodynamics. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85003972533&doi=10.1002%2f2016GL070248&partnerID=40&md5=04614eced45484c344481e9ef14eeb4e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9361
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Finnish Meteorological Institute, Helsinki, Finland
Recommended Citation:
Juusola L.,Archer W.E.,Kauristie K.,et al. Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements[J]. Geophysical Research Letters,2016-01-01,43(22).