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Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons
Chen, Lunjin; Maldonado, Armando; Bortnik, Jacob; Thorne, Richard M.; Li, Jinxing; Dai, Lei; Zhan, Xiaoya; Chen, LJ (reprint author), Univ Texas Dallas, Dept Phys, Richardson, TX 75083 USA.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2015
Volume120Issue:8Pages:6514-6527
ISSN2169-9380
Language英语
KeywordBounce Resonance Magnetosonic Waves Equatorial Noise Radiation Belt Wave-particle Interaction Nonlinear
AbstractEquatorially mirroring energetic electrons pose an interesting scientific problem, since they generally cannot resonate with any known plasma waves and hence cannot be scattered down to lower pitch angles. Observationally it is well known that the flux of these equatorial particles does not simply continue to build up indefinitely, and so a mechanism must necessarily exist that transports these particles from an equatorial pitch angle of 90 degrees down to lower values. However, this mechanism has not been uniquely identified yet. Here we investigate the mechanism of bounce resonance with equatorial noise (or fast magnetosonic waves). A test particle simulation is used to examine the effects of monochromatic magnetosonic waves on the equatorially mirroring energetic electrons, with a special interest in characterizing the effectiveness of bounce resonances. Our analysis shows that bounce resonances can occur at the first three harmonics of the bounce frequency (n omega(b), n = 1, 2, and 3) and can effectively reduce the equatorial pitch angle to values where resonant scattering by whistler mode waves becomes possible. We demonstrate that the nature of bounce resonance is nonlinear, and we propose a nonlinear oscillation model for characterizing bounce resonances using two key parameters, effective wave amplitude (A) over tilde and normalized wave number (k) over tilde (z). The threshold for higher harmonic resonance is more strict, favoring higher (A) over tilde and (k) over tilde (z), and the change in equatorial pitch angle is strongly controlled by (k) over tilde (z). We also investigate the dependence of bounce resonance effects on various physical parameters, including wave amplitude, frequency, wave normal angle and initial phase, plasma density, and electron energy. It is found that the effect of bounce resonance is sensitive to the wave normal angle. We suggest that the bounce resonant interaction might lead to an observed pitch angle distribution with a minimum at 90 degrees.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5089
Collection空间科学部
Corresponding AuthorChen, LJ (reprint author), Univ Texas Dallas, Dept Phys, Richardson, TX 75083 USA.
Recommended Citation
GB/T 7714
Chen, Lunjin,Maldonado, Armando,Bortnik, Jacob,et al. Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(8):6514-6527.
APA Chen, Lunjin.,Maldonado, Armando.,Bortnik, Jacob.,Thorne, Richard M..,Li, Jinxing.,...&Chen, LJ .(2015).Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(8),6514-6527.
MLA Chen, Lunjin,et al."Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.8(2015):6514-6527.
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