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Two-Dimensional gcPIC Simulation of Rising-Tone Chorus Waves in a Dipole Magneitic Field

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dc.contributorQuanming Lu, xywang@physics.auburn.eduen_US
dc.creatorLu, Quanming
dc.creatorKe, Yangguang
dc.creatorWang, Xueyi
dc.creatorLiu, Kaijun
dc.creatorGao, Xinliang
dc.creatorChen, Lunjin
dc.creatorWang, Shui
dc.description.abstractRising-tone chorus waves have already been successfully produced in a mirror magnetic field with the use of one- and two-dimensional particle-in-cell (PIC) simulations. However, in reality, the background magnetic field in the inner Earth's magnetosphere is a dipole magnetic field, unlike symmetric mirror fields. In this paper, with the two-dimensional (2-D) general curvilinear PIC (gcPIC) code, we investigate the generation of rising-tone chorus waves in the dipole magnetic field configuration. The plasma consists of three components: immobile ions, cold background, and hot electrons. In order to save computational resource, the topology of the magnetic field is roughly equal to that at L = 0.6 R-E, although the plasma parameters corresponding to those at L = 6 R-E (R-E is the Earth's radius) are used. Whistler mode waves are first excited around the magnetic equator by the hot electrons with a temperature anisotropy. The excited whistler mode waves propagate almost parallel and antiparallel to the background magnetic field in their source region, which is limited at vertical bar lambda vertical bar <= 3 degrees (where lambda is the magnetic latitude). When the waves leave from the source region and propagate toward high latitudes, both their amplitude and wave normal angle become larger. However, the group velocity of the waves is directed toward high latitudes almost along the magnetic field. During such a process, the waves have a frequency chirping, as shown by a rising tone in the frequency-time spectrogram. To our best knowledge, it is for the first time that rising-tone chorus are generated in a dipole magnetic field with a PIC simulation.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.rights©American Geophysical Union 2019. 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: Lu, Q., Ke, Y., Wang, X., Liu, K., Gao, X., Chen, L., & Wang, S. (2019). Two‐dimensional gcPIC simulation of rising‐tone chorus waves in a dipole magnetic field. Journal of Geophysical Research: Space Physics, 124(6), 4157-4167.en_US
dc.titleTwo-Dimensional gcPIC Simulation of Rising-Tone Chorus Waves in a Dipole Magneitic Fielden_US
dc.type.genreJournal Article, Academic Journalen_US

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