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Title: Identify the nonlinear wave-particle interaction regime in rising tone chorus generation

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary SciencesUniversity of Science and Technology of China, Hefei China, Collaborative Innovation Center of Astronautical Science and Technology, Harbin China
  2. ENEA C. R. Frascati, Frascati Italy, Institute of Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou China
  3. Institute of Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou China, Department of Physics and Astronomy, University of California, Irvine California USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1374448
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 8; Related Information: CHORUS Timestamp: 2018-04-02 17:11:09; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English

Citation Formats

Tao, Xin, Zonca, Fulvio, and Chen, Liu. Identify the nonlinear wave-particle interaction regime in rising tone chorus generation. United States: N. p., 2017. Web. doi:10.1002/2017GL072624.
Tao, Xin, Zonca, Fulvio, & Chen, Liu. Identify the nonlinear wave-particle interaction regime in rising tone chorus generation. United States. doi:10.1002/2017GL072624.
Tao, Xin, Zonca, Fulvio, and Chen, Liu. Sat . "Identify the nonlinear wave-particle interaction regime in rising tone chorus generation". United States. doi:10.1002/2017GL072624.
@article{osti_1374448,
title = {Identify the nonlinear wave-particle interaction regime in rising tone chorus generation},
author = {Tao, Xin and Zonca, Fulvio and Chen, Liu},
abstractNote = {},
doi = {10.1002/2017GL072624},
journal = {Geophysical Research Letters},
number = 8,
volume = 44,
place = {United States},
year = {Sat Apr 22 00:00:00 EDT 2017},
month = {Sat Apr 22 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/2017GL072624

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Chorus in the inner magnetosphere has been observed frequently at geomagnetically active times, typically exhibiting a two-band structure with a quasi-parallel lower band and an upper band with a broad range of wave normal angles. But recent observations by Van Allen Probes confirm another type of lower band chorus, which has a large wave normal angle close to the resonance cone angle. It has been proposed that these waves could be generated by a low-energy beam-like electron component or by temperature anisotropy of keV electrons in the presence of a low-energy plateau-like electron component. This paper, however, presents an alternativemore » mechanism for generation of this highly oblique lower band chorus. Through a nonlinear three-wave resonance, a quasi-parallel lower band chorus wave can interact with a mildly oblique upper band chorus wave, producing a highly oblique quasi-electrostatic lower band chorus wave. This theoretical analysis is confirmed by 2-D electromagnetic particle-in-cell simulations. Furthermore, as the newly generated waves propagate away from the equator, their wave normal angle can further increase and they are able to scatter low-energy electrons to form a plateau-like structure in the parallel velocity distribution. As a result, the three-wave resonance mechanism may also explain the generation of quasi-parallel upper band chorus which has also been observed in the magnetosphere.« less
    Cited by 2
  • Resonant pitch angle scattering by electromagnetic ion cyclotron (EMIC) waves has been suggested to account for the rapid loss of ring current ions and radiation belt electrons. For the rising tone EMIC wave (classified as triggered EMIC emission), its frequency sweep rate strongly affects the efficiency of pitch-angle scattering. Based on the Cluster observations, we analyze three typical cases of rising tone EMIC waves. Two cases locate at the nightside (22.3 and 22.6 magnetic local time (MLT)) equatorial region and one case locates at the duskside (18MLT) higher magnetic latitude (λ = –9.3°) region. For the three cases, the time-dependent wave amplitude,more » cold electron density, and cold ion density ratio are derived from satellite data; while the ambient magnetic field, thermal proton perpendicular temperature, and the wave spectral can be directly provided by observation. These parameters are input into the nonlinear wave growth model to simulate the time-frequency evolutions of the rising tones. The simulated results show good agreements with the observations of the rising tones, providing further support for the previous finding that the rising tone EMIC wave is excited through the nonlinear wave growth process.« less
  • A study on the amplification of ion acoustic wave in an inhomogeneous plasma has been made on the basis of a nonlinear wave-particle interaction process called plasma maser effect. The drift wave instability, which is a universal phenomenon of an inhomogeneous confined plasma system, is found to be strongly in phase relation with thermal particles and may transfer its wave energy nonlinearly through a modulated field to ion acoustic wave. Considering a Maxwellian distribution function model for inhomogeneous plasmas under the standard local approximation, we have estimated the growth rate for ion acoustic wave, which is obtained by using themore » nonlinear dispersion relation. It has been found that amplification of ion acoustic wave is possible at the expense of drift wave turbulent energy. This result may be particularly important for stability of various drift modes in magnetically confined plasma as well as for transport of momentum and energy in such inhomogeneous systems.« less