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Wave Normal Angle Distribution of Magnetosonic Waves in the Earth's Magnetosphere: 2-D PIC Simulation


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dc.contributorJicheng Sun, jzs0215@auburn.eduen_US
dc.creatorSun, Jicheng
dc.creatorChen, Lunjin
dc.creatorWang, Xueyi
dc.date.accessioned2022-10-11T19:53:07Z
dc.date.available2022-10-11T19:53:07Z
dc.date.created2020
dc.identifier10.1029/2020JA028012en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JA028012en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50387
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-455
dc.description.abstractRadiation belt electrons can be accelerated and scattered by magnetosonic waves in the Earth's magnetosphere, and the scattering rate of electrons is sensitive to the wave normal angle. However, observationally it is difficult to identify the wave normal angle within a few degrees. In this study, using 2-D particle-in-cell (PIC) simulations, we investigate the wave normal angle distribution of magnetosonic waves excited by ring distribution protons. Both the linear theory and simulations have shown that the wave normal angles are distributed over a narrow range (82 degrees -89 degrees) with a major peak at about 85 degrees during the linear growth stage when the proton ring velocity is close to the Alfven speed. In addition, 2-D PIC simulations further demonstrated that the waves tend to have larger wave normal angles (84 degrees -89 degrees) during the saturation stage since the waves with smaller wave normal angles are dissipated faster. It is also found that wave normal angles decrease with the increase of wave frequency. With the increase of the ring velocity of the proton ring distribution, the perpendicular wavenumber of excited magnetosonic waves decreases, which leads to the decrease of the wave normal angle. The simulation results provide a valuable insight to understand the property of magnetosonic waves, and the findings are useful for the global simulations of radiation belt dynamics. Key Points Using 2-D PIC simulations, the wave normal angle distribution of magnetosonic waves has been investigated The wave normal angles are distributed over a narrow range (82 degrees -89 degrees) during the linear growth stage The wave normal angles decrease with the increase of the ring velocity of the proton ring distributionen_US
dc.formatPDFen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2020. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Sun, Jicheng, Lunjin Chen, and Xueyi Wang. "Wave normal angle distribution of magnetosonic waves in the Earth's magnetosphere: 2‐D PIC simulation." Journal of Geophysical Research: Space Physics 125.5 (2020): e2020JA028012.en_US
dc.titleWave Normal Angle Distribution of Magnetosonic Waves in the Earth's Magnetosphere: 2-D PIC Simulationen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume125en_US
dc.citation.issue5en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-5059-5394en_US
dc.creator.orcid0000-0003-2489-3571en_US

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