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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Effect of oblique electromagnetic ion cyclotron waves on relativistic electron scattering: Combined Release and Radiation Effects Satellite (CRRES)-based calculation
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Effect of oblique electromagnetic ion cyclotron waves on relativistic electron scattering: Combined Release and Radiation Effects Satellite (CRRES)-based calculation

机译：倾斜电磁离子回旋波对相对论电子散射的影响：基于结合释放和辐射效应卫星（CRRES）的计算

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摘要

We consider the effect of oblique electromagnetic ion cyclotron (EMIC) waves on relativistic electron scattering in the outer radiation belt (RB) using simultaneous observations of plasma and wave parameters from Combined Release and Radiation Effects Satellite (CRRES). The main findings can be summarized as follows. First, in comparison with field-aligned waves, intermediate and highly oblique distributions decrease the range of pitch angles subject to diffusion and reduce the local scattering rate by about an order of magnitude at pitch angles where the principle |n| - 1 resonances operate. Oblique waves allow the |n| > 1 resonances to operate, extending the range of local pitch angle diffusion down to the loss cone, and increasing the diffusion at lower pitch angles by orders of magnitude. Second, the local diffusion coefficients derived from CRRES data are qualitatively similar to the local results obtained for prescribed plasma/wave parameters. Consequently, it is likely that the bounce-averaged diffusion coefficients, if estimated from concurrent data, will exhibit the dependencies similar to those we found for model calculations. Third, in comparison with field-aligned waves, intermediate and highly oblique waves decrease the bounce-averaged scattering rate near the edge of the equatorial loss cone by orders of magnitude if the electron energy does not exceed a threshold (～2–5 MeV) depending on specified plasma and/or wave parameters. Lastly, for greater electron energies, oblique waves operating the |n| > 1 resonances are more effective and provide the same bounce-averaged diffusion rate near the loss cone as field-aligned waves do.
机译：我们通过同时观测结合释放和辐射效应卫星（CRRES）的等离子体和波参数，考虑了倾斜电磁离子回旋加速器（EMIC）波对外辐射带（RB）中相对论电子散射的影响。主要发现可归纳如下。首先，与场对准波相比，中间和高度倾斜的分布减小了要扩散的俯仰角的范围，并且在原理为| n |的俯仰角处将局部散射率降低了大约一个数量级。 -1个共振动作。斜波允许| n |。 > 1个谐振进行操作，将局部螺距角扩散的范围向下扩展到了损耗锥，并以较低的螺距角将扩散增加了数量级。第二，从CRRES数据得出的局部扩散系数在质量上与针对规定的等离子体/波参数获得的局部结果相似。因此，如果从并发数据估算反弹平均扩散系数，则其依存性可能类似于我们在模型计算中发现的依存性。第三，与场对准波相比，如果电子能量不超过阈值（〜2–5 MeV），则中斜波和高斜波会使赤道损耗锥边缘附近的反弹平均散射率降低几个数量级。取决于指定的等离子和/或波参数。最后，对于更大的电子能量，斜波操作| n |。大于1的共振更有效，并且在损耗锥附近提供与场对准波相同的反弹平均扩散速率。

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