On the calculation of electric diffusion coefficient of radiation belt electrons with in situ electric field measurements by THEMIS
On the calculation of electric diffusion coefficient of radiation belt electrons with in situ electric field measurements by THEMIS
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DOI：
10.1002/2015gl067398
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
Wenlong Liu;W. Tu;Xinlin Li;T. Sarris;Y. Khotyaintsev;H. Fu;Hui Zhang;Q. Shi
中科院分区：
文献类型：
--
作者：
Wenlong Liu;W. Tu;Xinlin Li;T. Sarris;Y. Khotyaintsev;H. Fu;Hui Zhang;Q. Shi
基于7年的次暴事件与宏观尺度相互作用时程（THEMIS）观测，研究了不同地磁活动下电场Pc5 ULF波能的统计分布，并计算了外辐射带电子在电场作用下的径向扩散系数。的简单经验表达式也被导出。随后，我们与之前的dll模型进行了比较，并发现与模型相似的kp依赖性，该模型也是基于现场电场测量。的绝对值一直大于，可能是由于CRRES轨道覆盖范围有限。常用的和模型之间的差异是显著的，特别是对能量的依赖和依赖。讨论了这些差异的可能原因及其含义。本文提供的扩散系数也具有能量依赖性，将成为量化辐射带电子径向扩散过程的重要因素。
Based on 7 years' observations from Time History of Events and Macroscale Interactions during Substorms (THEMIS), we investigate the statistical distribution of electric field Pc5 ULF wave power under different geomagnetic activities and calculate the radial diffusion coefficient due to electric field, , for outer radiation belt electrons. A simple empirical expression of is also derived. Subsequently, we compare to previousDLLmodels and find similarKpdependence with the model, which is also based on in situ electric field measurements. The absolute value of is constantly higher than , probably due to the limited orbital coverage of CRRES. The differences between and the commonly used and models are significant, especially inKpdependence and energy dependence. Possible reasons for these differences and their implications are discussed. The diffusion coefficient provided in this paper, which also has energy dependence, will be an important contributor to quantify the radial diffusion process of radiation belt electrons.