A Parametric Study for the Generation of Ion Bernstein Modes from a Discrete Spectrum to a Continuous One in the Inner Magnetosphere. II. Particle-In-Cell Simulations

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A Parametric Study for the Generation of Ion Bernstein Modes from a Discrete Spectrum to a Continuous One in the Inner Magnetosphere. II. Particle-In-Cell Simulations

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Title: A Parametric Study for the Generation of Ion Bernstein Modes from a Discrete Spectrum to a Continuous One in the Inner Magnetosphere. II. Particle-In-Cell Simulations
Author(s):
Sun, J.;
Gao, X.;
Lu, Q.;
Chen, Lunjin ((UT Dallas);
Tao, X.;
Wang, S.
Item Type: Article
Keywords: Protons
Magnetohydrodynamic waves
Magnetic fields
Nuclear spin
Abstract: In this paper, we perform one-dimensional particle-in-cell simulations to investigate the properties of perpendicular magnetosonic waves in a plasma system consisting of three components: cool electrons, cool protons, and tenuous ring distribution protons, where the waves are excited by the tenuous proton ring distribution. Consistent with the linear theory, the spectra of excited magnetosonic waves can change from discrete to continuous due to the overlapping of adjacent unstable wave modes. The increase of the proton to electron mass ratio, the ratio of the light speed to the Alfven speed, or the concentration of protons with a ring distribution tends to result in a continuous spectrum of magnetosonic waves, while the increase of the ring velocity of the tenuous proton ring distribution leads to a broader one, but with a discrete structure. Moreover, the energization of both cool electrons and protons and the scattering of ring distribution protons due to the excited magnetosonic waves are also observed in our simulations, which cannot be predicted by the linear theory. Besides, a thermalized proton ring distribution may lead to the further excitation of several lower discrete harmonics with their frequencies about several proton gyrofrequencies.
Publisher: American Institute of Physics Inc
ISSN: 1070-664X
Persistent Link: http://hdl.handle.net/10735.1/5074
http://dx.doi.org/10.1063/1.4941284
Bibliographic Citation: Sun, J., X. Gao, Q. Lu, L. Chen, et al. 2016. "A parametric study for the generation of ion Bernstein modes from a discrete spectrum to a continuous one in the inner magnetosphere. II. Particle-in-cell simulations." Physics of Plasmas 23(2), doi:10.1063/1.4941284.
Terms of Use: ©2016 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Sponsors: National Science Foundation of China (Grant Nos. 41331067, 41474125, 11220101002, 11235009, 41174124, and 41121003), 973 Program (2013CBA01503 and 2012CB825602), and CAS Key Research Program (KZZD-EW-01-4).

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