DOI: 10.1002/2014GL062453
论文题名: Field-aligned currents' scale analysis performed with the Swarm constellation
作者: Lühr H. ; Park J. ; Gjerloev J.W. ; Rauberg J. ; Michaelis I. ; Merayo J.M.G. ; Brauer P.
刊名: Geophysical Research Letters
ISSN: 0094-9086
EISSN: 1944-8817
出版年: 2015
卷: 42, 期: 1 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: auroral ionosphere
; field-aligned currents
; temporal spatial characteristics
Scopus关键词: Ionosphere
; Orbits
; Statistics
; Auroral ionosphere
; Correlation analysis
; Field aligned currents
; Longitudinal extension
; Satellite formations
; Temporal and spatial
; Temporal variability
; Temporal-spatial characteristics
; Plasma flow
; correlation
; electrodynamics
; ionosphere
; magnetic field
; orbit determination
; satellite imagery
; standing wave
英文摘要: We present a statistical study of the temporal- and spatial-scale characteristics of different field-aligned current (FAC) types derived with the Swarm satellite formation. We divide FACs into two classes: small-scale, up to some 10 km, which are carried predominantly by kinetic Alfvén waves, and large-scale FACs with sizes of more than 150 km. For determining temporal variability we consider measurements at the same point, the orbital crossovers near the poles, but at different times. From correlation analysis we obtain a persistent period of small-scale FACs of order 10 s, while large-scale FACs can be regarded stationary for more than 60 s. For the first time we investigate the longitudinal scales. Large-scale FACs are different on dayside and nightside. On the nightside the longitudinal extension is on average 4 times the latitudinal width, while on the dayside, particularly in the cusp region, latitudinal and longitudinal scales are comparable. Key Points Temporal variability of field-aligned currents Longitudinal correlation length of field-aligned currents Small-scale FACs show very different characteristics than large-scale FACs ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921723657&doi=10.1002%2f2014GL062453&partnerID=40&md5=9780589b15b232377ebb4ee2bc571478
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8702
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: GFZ, German Research Center for Geosciences, Potsdam, Germany
Recommended Citation:
Lühr H.,Park J.,Gjerloev J.W.,et al. Field-aligned currents' scale analysis performed with the Swarm constellation[J]. Geophysical Research Letters,2015-01-01,42(1).