Dynamic Evolution of Outer Radiation Belt Electrons due to Whistler-Mode Chorus |
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| Authors: | SU Zhen-Peng ZHENG Hui-Nan XIONG Ming |
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| Affiliation: | 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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| 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 atsmaller 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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