Astrophysics and Space Science

, Volume 354, Issue 2, pp 401–408 | Cite as

Effect of chorus normal angle on dynamic evolution of radiation belt energetic electrons

  • Lewei Zhang
  • Yihua He
  • Si Liu
  • Chang Yang
  • Qinghua Zhou
  • Fuliang Xiao
Original Article
First Online:
Received:
Accepted:

Abstract

Gyroresonance between chorus waves and radiation belt electrons is usually evaluated by using the Gaussian wave normal angle (X=tanθ) distribution. In this study, we examine the influence of peak wave normal angle (X m =tanθ m ) on chorus-electron interaction in the heart of radiation belts L=4.5. By varying X m =0,2,4,6, we calculate the bounce-averaged diffusion coefficients, and then simulate the phase space density (PSD) evolution of radiation belt energetic electrons induced by both dayside and nightside chorus waves. Numerical simulations show that diffusion coefficients move to the low pitch angle region and drop rapidly by a factor of ∼10 as X m increases by 2 each time, consequently leading to the smaller amplitude and narrower pitch angle region in electron PSD evolution. The current results demonstrate that chorus-electron interaction in the outer radiation belt is largely dependent on peak wave normal angles.

Keywords

Diffusion coefficients Phase space density evolution Chorus normal angle Chorus-electron interaction Radiation belt electrons 
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Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China grants 41274165, 41204114, the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province, and the Construct Program of the Key Discipline in Hunan Province.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Lewei Zhang
    • 1
  • Yihua He
    • 1
  • Si Liu
    • 1
  • Chang Yang
    • 1
  • Qinghua Zhou
    • 1
  • Fuliang Xiao
    • 1
  1. 1.School of Physics and Electronic SciencesChangsha University of Science and TechnologyChangshaChina

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