scholarly journals Relativistic turning acceleration of radiation belt electrons by whistler mode chorus

2008 ◽  
Vol 113 (A4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Naoki Furuya ◽  
Yoshiharu Omura ◽  
Danny Summers
Keyword(s):  
Radiation Belt ◽  
Whistler Mode ◽  
Radiation Belt Electrons

scholarly journals Rapid energization of radiation belt electrons by nonlinear wave trapping

2008 ◽  
Vol 26 (11) ◽  
pp. 3451-3456 ◽  
Author(s):  
Y. Katoh ◽  
Y. Omura ◽  
D. Summers
Keyword(s):  
Nonlinear Wave ◽  
Significant Role ◽  
Radiation Belt ◽  
Magnetic Mirror ◽  
Generation Process ◽  
Whistler Mode ◽  
Wave Trapping ◽  
Particle Simulations ◽  
Radiation Belt Electrons ◽  
Particle Energization

Abstract. We show that nonlinear wave trapping plays a significant role in both the generation of whistler-mode chorus emissions and the acceleration of radiation belt electrons to relativistic energies. We have performed particle simulations that successfully reproduce the generation of chorus emissions with rising tones. During this generation process we find that a fraction of resonant electrons are energized very efficiently by special forms of nonlinear wave trapping called relativistic turning acceleration (RTA) and ultra-relativistic acceleration (URA). Particle energization by nonlinear wave trapping is a universal acceleration mechanism that can be effective in space and cosmic plasmas that contain a magnetic mirror geometry.

scholarly journals Rapid flattening of butterfly pitch angle distributions of radiation belt electrons by whistler-mode chorus

2016 ◽  
Vol 43 (16) ◽  
pp. 8339-8347 ◽  
Author(s):  
Chang Yang ◽  
Zhenpeng Su ◽  
Fuliang Xiao ◽  
Huinan Zheng ◽  
Yuming Wang ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Radiation Belt ◽  
Whistler Mode ◽  
Radiation Belt Electrons

scholarly journals Nonlinear interactions between relativistic radiation belt electrons and oblique whistler mode waves

2010 ◽  
Vol 17 (5) ◽  
pp. 599-604 ◽  
Author(s):  
X. Tao ◽  
J. Bortnik
Keyword(s):  
Radiation Belt ◽  
Nonlinear Interactions ◽  
Whistler Mode ◽  
Nonlinear Phase ◽  
Resonant Interactions ◽  
Induced Motion ◽  
Radiation Belt Electrons ◽  
Whistler Mode Waves ◽  
Adiabatic Motion ◽  
Wave Induced

Abstract. Resonant interactions between relativistic charged particles and oblique whistler mode waves are explored in this work, and it is shown that nonlinear phase trapping could happen in a gyrophase averaged sense, consistent with previous studies of interactions between nonrelativistic electrons and oblique whistler mode waves. A dimensionless parameter χ is derived to represent the ratio of wave-induced motion to the adiabatic motion of the particle. We show that phase trapping is likely to occur when the wave-induced motion dominates the adiabatic motion, which is caused mainly by the background fields. A mapping of probable regions of nonlinear interactions is shown based on the parameter χ. We show that the nonlinear interactions might be important near the equatorial plane for even moderate wave amplitude, and the latitudinal range for nonlinear interactions to occur is largest for electrons with local pitch angles around 50 degrees, consistent with previous findings. The results are important for understanding the nonlinear dynamics of relativistic radiation belt electrons and the generation of chorus waves.

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