%0 Journal Article
%T Pitch Angle Distribution Evolution of Energetic Electrons by Whistler-Mode Chorus<br>
%A ZHENG Hui-Nan
%A SU Zhen-Peng
%A XIONG Ming
%A <br>
%J 中国物理快报
%D 2008
%I 
%X 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.
%K 94
%K 20
%K Wj
%K 52
%K 35
%K Hr
%K 94
%K 30
%K Lr
%K 94
%K 30
%K Hn<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=B26674C1B8E0C27C4EF0E167B41B1EFD&yid=67289AFF6305E306&vid=C5154311167311FE&iid=9CF7A0430CBB2DFD&sid=E0B17D28B6991BBF&eid=C6BB6353830738D7&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0