A Study of the Coefficient a in the Extended Nonlinear Guiding Center Theory |
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| Authors: | Zhu Yu-ting Qin Gang Le Gui-ming |
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| Institution: | 1. Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081;2. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;3. National Center for Space Weather, China Meteorological Administration, Beijing 100081 |
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| Abstract: | The diffusion mechanism of charged particles is one of the very im- portant problems in astrophysics. Recently, Matthaeus et al. (2003) developed a nonlinear guiding center theory (NLGC) of the perpendicular diffusion of en- ergetic charged particles with the parallel diffusion coefficient as an input. This theory agrees with the results of numerical simulations very well. In addition, Qin (2007) developed a nonlinear parallel diffusion theory (NLPA) following the idea of NLGC. Combining the NLGC with the NLPA, a new theory, NLGC-E was developed to solve the parallel and perpendicular diffusion coefficients simultaneously. In the NLGC theory, there is a coefficient a2 which is selected to be 1/3 for the best agreement with the results of numerical simulations. In this work we tried the different values of a2 for the NLGC-E theory to determine the optimal value which ?ts best the results of numerical simulations. |
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| Keywords: | ISM cosmic rays&mdash cosmology theory |
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