Generation of Magnetosonic Waves Over a Continuous Spectrum

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dc.contributor.ORCID0000-0003-2489-3571 (Chen, L)en_US
dc.contributor.authorChen, Lunjinen_US
dc.contributor.authorSun, J.en_US
dc.contributor.authorLu, Q.en_US
dc.contributor.authorGao, X.en_US
dc.contributor.authorXia, Zhiyangen_US
dc.contributor.authorZhima, Zerenen_US
dc.contributor.utdAuthorChen, Lunjinen_US
dc.contributor.utdAuthorXia, Zhiyangen_US
dc.contributor.utdAuthorZhima, Zerenen_US
dc.date.accessioned2016-09-26T19:06:59Z
dc.date.available2016-09-26T19:06:59Z
dc.date.created2016-01-08en_US
dc.date.issued2016-01-08en_US
dc.description.abstractMagnetosonic waves, also known as equatorial noise emission, were found to have discrete frequency structures, which is consistent with instability caused by proton ring distribution. Nonetheless, nondiscrete structure, i.e., a broadband spectrum over a continuous frequency range, has been reported. We investigate the question whether proton ring distribution can generate nondiscrete spectra for perpendicularly propagating magnetosonic waves. We propose discrete and nondiscrete characteristics of the local instability for explaining the observation of discrete, continuous, and mixed spectra. The criterion for transition from discrete and continuous instability is given, γ > ~ Ω(h)/2, where γ is wave growth rate and Ω(h) is proton cyclotron frequency. The condition is verified by particle-in-cell simulation using more realistic electron-to-proton mass ratio and speed of light than in previous studies. Such criterion of generating a continuous spectrum can be tested against simultaneous in situ measurement of wave and particle. We also find that the modes at low Ω(h) harmonics, including the fundamental Ω(h'), can be still excited through nonlinear wave-wave coupling, even when they are neutral modes (γ = 0) according to the linear kinetic theory. Comparison with magnetosonic waves in cold plasma limit and electromagnetic ion Bernstein mode is also discussed.en_US
dc.description.sponsorshipThis research was supported by the NSF grant AGS-140504. The work at USTC was supported by the National Science Foundation of China, grants 41331067, 41474125, 41174124, and 11235009.en_US
dc.identifier.bibliographicCitationChen, L., J. Sun, Q. Lu, X. Gao, et al. 2016. "Generation of magnetosonic waves over a continuous spectrum." Journal of Geophysical Research A: Space Physics 121(2), doi:10.1002/2015JA022089 .en_US
dc.identifier.issn2169-9380en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5070
dc.language.isoenen_US
dc.publisherBlackwell Publishing Ltden_US
dc.relation.urihttp://dx.doi.org/10.1002/2015JA022089
dc.rights©2016 American Geophysical Unionen_US
dc.sourceJournal of Geophysical Research A: Space Physics
dc.subjectFrequency spectraen_US
dc.subjectMagnetospheric physicsen_US
dc.subjectProtonsen_US
dc.subjectElectromagnetic noiseen_US
dc.titleGeneration of Magnetosonic Waves Over a Continuous Spectrumen_US
dc.type.genreArticleen_US

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