The Implications of Temporal Variability in Wave-Particle Interactions in Earth's Radiation Belts
The Implications of Temporal Variability in Wave-Particle Interactions in Earth's Radiation Belts
复制标题
地球辐射带波粒相互作用的时间变化的影响
DOI：
10.1029/2020gl089962
复制
发表时间：
2021
影响因子：
5.2
通讯作者：
Watt C
中科院分区：
文献类型：
--
作者：
Watt C
地球外辐射带电子通量的变化可以使用基于扩散的框架进行建模。此类模型的扩散系数通常是根据观察到的输入的统计平均值构建的。在这里，我们使用随机参数化来研究 D 中时间变化的后果。使用范艾伦探针观测来限制变异时间尺度。将随机参数化实验的结果与使用从平均输入和观察特定 D 的平均值构建的 D 的实验进行比较。我们发现数值实验的演化和最终状态取决于 D 的变化时间尺度；即使时间积分扩散相同，具有较长可变性时间尺度的实验与具有较短时间尺度的实验也不同。短变异性时间尺度实验与使用平均观察特定 D 获得的解决方案收敛，并且两者都比使用平均输入 D 的实验表现出更大的扩散。这些实验揭示了辐射带扩散中时间变化的重要性。
Changes in electron flux in Earth's outer radiation belt can be modeled using a diffusion‐based framework. Diffusion coefficientsDfor such models are often constructed from statistical averages of observed inputs. Here, we use stochastic parameterization to investigate the consequences of temporal variability inD. Variability time scales are constrained using Van Allen Probe observations. Results from stochastic parameterization experiments are compared with experiments usingDconstructed from averaged inputs and an average of observation‐specificD. We find that the evolution and final state of the numerical experiment depends upon the variability time scale ofD; experiments with longer variability time scales differ from those with shorter time scales, even when the time‐integrated diffusion is the same. Short variability time scale experiments converge with solutions obtained using an averaged observation‐specificD, and both exhibit greater diffusion than experiments using the averaged‐inputD. These experiments reveal the importance of temporal variability in radiation belt diffusion.