Recent developments in the radiation belt environment model
Recent developments in the radiation belt environment model
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DOI：
10.1016/j.jastp.2010.09.033
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发表时间：
2011-07
影响因子：
1.9
通讯作者：
M. Fok;A. Glocer;Q. Zheng;Q. Zheng;R. Horne;N. Meredith;J. Albert;T. Nagai
中科院分区：
文献类型：
--
作者：
M. Fok;A. Glocer;Q. Zheng;Q. Zheng;R. Horne;N. Meredith;J. Albert;T. Nagai
高能粒子在辐射带的通量被发现强烈控制的太阳风条件。为了理解和预测辐射粒子的强度，我们开发了一个基于物理的辐射带环境（RBE）模型，该模型考虑了太阳风、环电流和等离子体的影响。最近，波粒相互作用的一种改进的计算已经被纳入。特别地，该模型现在包括能量和俯仰角的交叉扩散。我们发现，排除交叉扩散可能会导致显着高估的电子通量增强风暴恢复。RBE模式也连接到MHD场，以便可以研究辐射带对全球磁层快速变化的响应。我们能够重现2008年9月4日亚暴偶极期间的快速通量增加。这个时间比波相关加速度的时间尺度要短得多。
The fluxes of energetic particles in the radiation belts are found to be strongly controlled by the solar wind conditions. In order to understand and predict the radiation particle intensities, we have developed a physics-based Radiation Belt Environment (RBE) model that considers the influences from the solar wind, ring current and plasmasphere. Recently, an improved calculation of wave-particle interactions has been incorporated. In particular, the model now includes cross diffusion in energy and pitch-angle. We find that the exclusion of cross diffusion could cause significant overestimation of electron flux enhancement during storm recovery. The RBE model is also connected to MHD fields so that the response of the radiation belts to fast variations in the global magnetosphere can be studied. We are able to reproduce the rapid flux increase during a substorm dipolarization on 4 September 2008. The timing is much shorter than the time scale of wave associated acceleration.