Model of lifetimes of the outer radiation belt electrons in a realistic magnetic field using realistic chorus wave parameters
Model of lifetimes of the outer radiation belt electrons in a realistic magnetic field using realistic chorus wave parameters
复制标题
使用真实合唱波参数的真实磁场中外辐射带电子的寿命模型
DOI：
10.1002/2013ja019596
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Shprits
中科院分区：
文献类型：
--
作者：
K. Orlova;Y. Shprits
在地磁扰动条件下，磁层内的外辐射带电子表现出很高的变化性。准线性扩散理论为不同能量下粒子损失的全球预测提供了一个框架，并为理解不同粒子群的动力学提供了一个框架。最近已经表明，由于在现实磁场中建模的与合唱波的波粒子相互作用而引起的电子的俯仰角散射可能与偶极子模型中估计的那些显著不同。在这项工作中，我们提出了1 keV-2 MeV的电子的寿命计算在Tsyganenko 89磁场模型的夜晚，黎明，中午前，和中午后的磁场当地时间（MLT）部门的不同水平的地磁活动和距离。在现实的领域中的寿命进行了比较，在偶极子模型中计算。我们开发了一个现实的合唱低波段和高波段波模型，每个MLT部门使用最近的统计研究波振幅，波法线角，和波谱密度分布的磁纬度，距离和Kp指数的函数。等离子体槽密度随纬度的增加而增加。在Tsyganenko 89场中获得的电子寿命是参数化的，可以用于2-D/3-D/4-D对流和粒子追踪代码。
The outer radiation belt electrons in the inner magnetosphere show high variability during the geomagnetically disturbed conditions. Quasi‐linear diffusion theory provides both a framework for global prediction of particle loss at different energies and an understanding of the dynamics of different particle populations. It has been recently shown that the pitch angle scattering of electrons due to wave‐particle interaction with chorus waves modeled in a realistic magnetic field may be significantly different from those estimated in a dipole model. In this work, we present the lifetimes of 1 keV–2 MeV electrons computed in the Tsyganenko 89 magnetic field model for the night, dawn, prenoon, and postnoon magnetic local time (MLT) sectors for different levels of geomagnetic activity and distances. The lifetimes in the realistic field are also compared to those computed in the dipole model. We develop a realistic chorus lower band and upper band wave models for each MLT sector using the recent statistical studies of wave amplitude, wave normal angle, and wave spectral density distributions as functions of magnetic latitude, distance, and Kp index. The increase of plasma trough density with increasing latitude is also included. The obtained in the Tsyganenko 89 field electron lifetimes are parameterized and can be used in 2‐D/3‐D/4‐D convection and particle tracing codes.