DOI: 10.1029/2018JA025638
Scopus记录号: 2-s2.0-85052471538
论文题名: Modeling the Dawn/Dusk Asymmetry of Field Line Resonances
作者: Wright A.N. ; Elsden T. ; Takahashi K.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 6443
结束页码: 6456
语种: 英语
英文关键词: 3-D Alfvén resonances
; field line resonances
; magnetospheric waveguide
; Pc5 ULF waves
英文摘要: Field line resonances (FLRs) are observed to occur preferentially and have larger amplitudes at dawn compared to dusk. We present simulations of FLR excitation in a magnetospheric waveguide that can reproduce this behavior. Crucially, our equilibrium is asymmetric about noon. Even when this system is driven in a symmetric fashion about noon, the fast waves that are established in the magnetosphere develop asymmetries—as do the FLRs they excite. Fast mode ray trajectories are employed to show that the asymmetry evolves due to refraction. Preferential FLR excitation at dawn is further reinforced by calculating the Resonance Map. This shows that the Resonant Zone at dawn coincides with a large-amplitude coherent fast mode driver, which is not the case at dusk. These factors result in FLRs having a larger amplitude at dawn compared to dusk. ©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/113291
Appears in Collections: 气候减缓与适应
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作者单位: Department of Mathematics and Statistics, University of St Andrews, St Andrews, United Kingdom; The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States
Recommended Citation:
Wright A.N.,Elsden T.,Takahashi K.. Modeling the Dawn/Dusk Asymmetry of Field Line Resonances[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)