DOI: 10.1029/2018JA025254
Scopus记录号: 2-s2.0-85050267022
论文题名: Temporal and Spatial Development of Global Birkeland Currents
作者: Anderson B.J. ; Olson C.N. ; Korth H. ; Barnes R.J. ; Waters C.L. ; Vines S.K.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 6 起始页码: 4785
结束页码: 4808
语种: 英语
英文关键词: activity onset
; Birkeland currents
; field-aligned currents
; ionospheric convection
英文摘要: The development of large-scale Birkeland currents is examined using the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE), which measures global Birkeland currents continuously on 10-min time scales. The integrated current was used to identify onsets of at least 1 MA preceded by periods of quiescence lasting at least 3 hr. The Region 1 currents do not fully form without Region 2. Rather, they develop together, first on the dayside, then on the nightside, and lastly, they fill in and intensify at all local times to form the nominal statistical pattern. The onsets are closely correlated with enhancements of magnetospheric forcing as indicated by the solar wind electric field and the orientation of the interplanetary magnetic field. Nightside onsets correspond to intensifications of the auroral electrojet as reflected in the AE index; they are delayed by ~40 min relative to the increase of the dayside current and are 2.8 times more rapid than the dayside current increase. After nightside onset, Birkeland currents expand toward dawn and dusk and merge with the dayside currents while also intensifying at all local times. The dayside current pattern depends on the sign of the interplanetary magnetic field BY. The nightside current distributions are the same for positive and negative BY and display a Harang discontinuity independent of the sign of BY. The predominant development and intensification of Birkeland currents occur after nightside onset at all local times with roughly 75% of the total current, both Regions 1 and 2, appearing after nightside onset. ©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/113831
Appears in Collections: 气候减缓与适应
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作者单位: Space Exploration Sector, The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States; Department of Physics, Augsburg University, Minneapolis, MN, United States; School of Mathematical and Physical Sciences, University of Newcastle, Callaghan, NSW, Australia
Recommended Citation:
Anderson B.J.,Olson C.N.,Korth H.,et al. Temporal and Spatial Development of Global Birkeland Currents[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)