| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Dynamic Evolution of Outer Radiation Belt Electrons due to Whistler-Mode Chorus |
| SU Zhen-Peng, ZHENG Hui-Nan, XIONG Ming |
| CAS Key Lab for Basic Plasma Science, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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SU Zhen-Peng, ZHENG Hui-Nan, XIONG Ming 2009 Chin. Phys. Lett. 26 039401 |
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Abstract Following our preceding work, we perform a further study on dynamic evolution of energetic electrons in the outer radiation belt L=4.5 due to a band of whistler-mode chorus frequency distributed over a standard Gaussian spectrum. We solve the 2D bounce-averaged Fokker-Planck equation by allowing incorporation of cross diffusion rates. Numerical results show that whistler-mode chorus can be effective in acceleration of electrons at large pitch angles, and enhance the phase space density for energies of about 1MeV by a factor of 102 or above in about one day, consistent with observation of significant enhancement in flux of energetic electrons during the recovery phase of a geomagnetic storm. Moreover, neglecting cross diffusion often leads to overestimates of the phase space density evolution at large pitch angle by a factor of 5-10 after one day, with larger errors at
smaller pitch angle, suggesting that cross diffusion also plays an important role in wave-particle interaction.
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| Keywords:
94.20.Wj
52.35.Hr
94.30.Lr
94.30.Hn
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Received: 07 July 2008
Published: 19 February 2009
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| PACS: |
94.20.wj
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(Wave/particle interactions)
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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94.30.Lr
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(Magnetic storms, substorms)
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94.30.Hn
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(Energetic trapped particles)
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