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Two-Dimensional Particle-in-Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field


Metadata FieldValueLanguage
dc.contributorXueyi Wang; wangxue@auburn.eduen_US
dc.creatorChen, Lunjin
dc.creatorSun, Jicheng
dc.creatorLu, Quanming
dc.creatorWang, Xueyi
dc.creatorGao, Xinliang
dc.creatorWang, Dedong
dc.creatorWang, Shui
dc.date.accessioned2020-05-27T20:52:29Z
dc.date.available2020-05-27T20:52:29Z
dc.date.created2018
dc.identifier10.1029/2018GL079067en_US
dc.identifier.urihttps://agupubs-onlinelibrary-wiley-com.spot.lib.auburn.edu/doi/full/10.1029/2018GL079067en_US
dc.identifier.urihttp://hdl.handle.net/11200/49820
dc.description.abstractThe excitation of magnetosonic waves in the meridian plane of a rescaled dipole magnetic field is investigated, for the first time, using a general curvilinear particle-in-cell simulation. Our simulation demonstrates that the magnetosonic waves are excited near the equatorial plane by tenuous ring distribution protons. The waves propagate nearly perpendicularly to the background magnetic field along both radially inward and outward directions. Different speeds of inward and outward propagation result in the asymmetrical distribution about the source region. The waves are accompanied by energization of both cool protons and electrons near the wave source region. The cool protons are heated perpendicularly, while the cool electrons can be heated in the parallel direction and also experience enhanced perpendicular drift at the presence of intense wave power. The implications of simulation results to the observations of magnetosonic waves and related particle heating in the inner magnetosphere are also discussed. Plain Language Summary The Earth's radiation belt is a natural space environment consisting of relativistic electrons trapped in geospace. It exhibits great variability due to solar activities and poses a great threat to spacecraft orbiting in the regions and to astronauts. The primary physical process involved for radiation belt variability is through interaction with electromagnetic waves. Magnetosonic waves are one of the important waves that are capable of electron scattering, the efficiency of which depends on the wave detailed properties. Previous simulation has investigated the wave excitation in a homogeneous plasma. Here we present for the first time a 2-D particle-in-cell simulation to understand magnetosonic wave excitation and propagation in an inhomogeneous dipole magnetic field. The simulation results not only illustrate the wave temporal evolution and spatial distribution, both in radial and latitudinal distribution, but also reveal their effects on thermal electron and proton heating. These results are ready for verification against wave and particle measurement from the ongoing magnetospheric missions such as Van Allen Probes.en_US
dc.formatPDFen_US
dc.relation.ispartofGeophysical Research Lettersen_US
dc.relation.ispartofseries0094-8276en_US
dc.rights© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subjectelectronsen_US
dc.subjectenergetic ionsen_US
dc.subjectequatorial noiseen_US
dc.subjectmagnetosphereen_US
dc.subjectpropagationen_US
dc.subjectresonanceen_US
dc.subjectring distributionsen_US
dc.subjectulf wavesen_US
dc.titleTwo-Dimensional Particle-in-Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Fielden_US
dc.typeCollectionen_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume45en_US
dc.citation.issue17en_US
dc.citation.spage8712en_US
dc.citation.epage8720en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US

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