Astrophysics and Space Science

, Volume 355, Issue 2, pp 245–251 | Cite as

Correlated observations and simulations on the buildup of radiation belt electron fluxes driven by substorm injections and chorus waves

  • Zhaoguo He
  • Hui Zhu
  • Siqing Liu
  • Qiugang Zong
  • Yongfu Wang
  • Ruilin Lin
  • Liqin Shi
  • Jiancun Gong
Original Article


We report the multi-satellite (LANL, GOES-10 and Cluster) observation data of electron flux evolutions and chorus wave excitation in the radiation belt during the geomagnetic storm and substorm from 10 to 14 January, 2002. The seed (50–225 keV) electron flux increased 50 times in five hours during the storm main phase, and the relativistic (>0.6 MeV) electron flux increased about 60 times at night side during the recovery phase. In the meanwhile, the Cluster satellites detected intense chorus waves (the wave power up to ∼10−3 nT2 Hz−1) at MLT≈3 when passing through the outer radiation belt. Using a Gaussian fit to the observed chorus spectra, we calculate the drift-averaged diffusion coefficients and then solve a 2-D Fokker-Planck diffusion equation. We simulate the energetic electron flux evolutions driven by chorus waves in two cases: with and without seed electron injections. We show that the energetic electron flux increases 79 times in three days with injection, comparable to the observation. However, the flux increases only 3 times in three days without injection, far below the observation. The current results suggest that the injected seed electrons and chorus waves play important roles in the buildup of the radiation belt electrons.


Radiation belt Substorm Seed electron injection Chorus waves Acceleration Energetic electron 



This work was supported by 973 program 2012CB25600 and 2011CB811406. We thank the CDAWeb and Cluster science teams for the data used in this study.


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Zhaoguo He
    • 1
  • Hui Zhu
    • 2
  • Siqing Liu
    • 1
  • Qiugang Zong
    • 3
  • Yongfu Wang
    • 3
  • Ruilin Lin
    • 1
  • Liqin Shi
    • 1
  • Jiancun Gong
    • 1
  1. 1.Center for Space Science and Applied ResearchChinese Academy of SciencesBeijingChina
  2. 2.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefeiChina
  3. 3.Institute of Space Physics and Applied TechnologyPeking UniversityBeijingChina

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