Wright_et_al_2018_JGR.pdf (1.78 MB)
Modeling the Dawn/Dusk Asymmetry of Field Line Resonances
journal contribution
posted on 2020-04-08, 11:16 authored by Andrew N Wright, Tom Elsden, Kazue TakahashiField 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.
Funding
Funding Information STFC. Grant Number: ST/N000609/1 Leverhulme Trust. Grant Number: RPG-2016-071 NASA. Grant Number: NNX17AD34G
History
Citation
Wright, A. N., Elsden, T., & Takahashi, K. ( 2018). Modeling the dawn/dusk asymmetry of field line resonances. Journal of Geophysical Research: Space Physics, 123, 6443– 6456. https://doi.org/10.1029/2018JA025638Version
- VoR (Version of Record)
Published in
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSVolume
123Issue
8Pagination
6443 - 6456 (14)Publisher
AMER GEOPHYSICAL UNIONissn
2169-9380eissn
2169-9402Acceptance date
2018-06-28Copyright date
2018Available date
2018-07-05Publisher DOI
Publisher version
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025638Language
EnglishUsage metrics
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