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Pitch Angle Distribution Evolution of Energetic Electrons by Whistler-Mode Chorus |
| ZHENG Hui-Nan, SU Zhen-Peng, 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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ZHENG Hui-Nan, SU Zhen-Peng, XIONG Ming 2008 Chin. Phys. Lett. 25 3515-3518 |
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Abstract We develop a two-dimensional momentum and pitch angle code to solve the typical Fokker--Planck equation which governs wave--particle interaction in space plasmas. We carry out detailed calculations of momentum and pitch angle diffusion coefficients, and temporal evolution of pitch angle distribution for a band of chorus frequency distributed over a standard Gaussian spectrum particularly in the heart of the Earth's radiation belt L=4.5, where peaks of the electron phase space density are observed. We find that the Whistler-mode chorus can produce significant acceleration of electrons at large pitch angles, and can enhance the phase space density for energies of 0.5~1MeV by a factor of 10 or above after about 24h. This result can account for observation of significant enhancement in flux of energetic electrons during the recovery phase of a geomagnetic storm.
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94.20.Wj. 52.35.Hr
94.30.Lr
94.30.Hn
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Received: 22 April 2008
Published: 29 August 2008
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