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The influence of various frequency chorus waves on electron dynamics in radiation belts

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Abstract

Non-adiabatic behaviour induced by the chorus-electron interaction is an important contributor to the radiation belt dynamics, and largely relies on wave frequency distribution. During the geomagnetic storm on August 2, 2016, upper-band, lower-band and extremely low frequency (ELF) chorus waves were simultaneously observed within one orbit period of the Van Allen Probe B. Numerical simulations are performed to investigate the electron evolution by the observed chorus with different frequencies. The results show that various frequency chorus waves have different effects on electron dynamics. For chorus in the range f≈0.3fce−0.7fce, energy diffusion is the dominant process in electron evolutions. For chorus in the range 0.1fce⩽f⩽0.25fce, the pitch angle diffusion tends to be comparable to energy diffusion for Ek>0.5 MeV. For ELF chorus below 0.1fce, the pitch angle diffusion rate is much above the energy diffusion rate, leading to potential scattering losses.

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Authors and Affiliations

  1. School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha, 410114, China

    JiaBei He, FuLiang Xiao, Chang Yang, Qian He, ChengZhi Wang, XiongJun Shang, Si Liu, QingHua Zhou & Sai Zhang

  2. CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, 230026, China

    JiaBei He & YuYue Jin

  3. Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, 519082, China

    ZhaoGuo He

  4. College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, 211101, China

    YanQiong Xie

Authors
  1. JiaBei He
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  2. YuYue Jin
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  3. FuLiang Xiao
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  4. ZhaoGuo He
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  5. Chang Yang
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  7. Qian He
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  10. Si Liu
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  12. Sai Zhang
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Corresponding authors

Correspondence to FuLiang Xiao or ZhaoGuo He.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 41531072, 41974212, 41774194, 42074198 and 42004141), the Hunan Provincial Natural Science Foundation of China (Grant No. 2018JJ2425), the Foundation of Education Bureau of Hunan Province for Distinguished Young Scientists (Grant No. 20B004), and the Specialized Research Fund for CAS Key Laboratories. The Van Allen Probes data can be found at the following website: https://spdf.gsfc.nasa.gov/pub/data/rbsp/.

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He, J., Jin, Y., Xiao, F. et al. The influence of various frequency chorus waves on electron dynamics in radiation belts. Sci. China Technol. Sci. 64, 890–897 (2021). https://doi.org/10.1007/s11431-020-1750-6

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  • DOI: https://doi.org/10.1007/s11431-020-1750-6

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