DOI: 10.1002/2015GL065464
论文题名: Theory and observations of upward field-aligned currents at the magnetopause boundary layer
作者: Wing S. ; Johnson J.R.
刊名: Geophysical Research Letters
ISSN: 0094-8486
EISSN: 1944-8217
出版年: 2015
卷: 42, 期: 21 起始页码: 9149
结束页码: 9155
语种: 英语
英文关键词: boundary layer
; current dynamo
; current width
; field-aligned current
; parallel potential
; velocity shear
Scopus关键词: Analytical models
; Boundary layers
; Magnetopause
; Plasma flow
; Boundary layer structure
; Direct observations
; Field aligned currents
; Ionospheric parameters
; Parallel currents
; parallel potential
; Scaling properties
; Velocity shear
; Shear flow
; analytical method
; boundary layer
; current direction
; electric field
; ionosphere
; magnetopause
; pressure gradient
; shear stress
; solar wind
英文摘要: The dependence of the upward field-aligned current density (J||) at the dayside magnetopause boundary layer is well described by a simple analytic model based on a velocity shear generator. A previous observational survey confirmed that the scaling properties predicted by the analytical model are applicable between 11 and 17 MLT. We utilize the analytic model to predict field-aligned currents using solar wind and ionospheric parameters and compare with direct observations. The calculated and observed parallel currents are in excellent agreement, suggesting that the model may be useful to infer boundary layer structures. However, near noon, where velocity shear is small, the kinetic pressure gradients and thermal currents, which are not included in the model, could make a small but significant contribution to J||. Excluding data from noon, our least squares fit returns log(J||,max-cal) = (0.96 ± 0.04) log(J||-obs) + (0.03 ± 0.01) where J||,max-cal = calculated J||,max and J||-obs = observed J||. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954532002&doi=10.1002%2f2015GL065464&partnerID=40&md5=3bac611e36c40200ad43b0cb6fef21d7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8102
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: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States
Recommended Citation:
Wing S.,Johnson J.R.. Theory and observations of upward field-aligned currents at the magnetopause boundary layer[J]. Geophysical Research Letters,2015-01-01,42(21).