Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves
Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves
复制标题
宽带电磁波中辐射带电子的俯仰角散射和损耗
DOI：
10.1029/2018gl079527
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发表时间：
2018
影响因子：
5.2
通讯作者：
J. Wygant
中科院分区：
文献类型：
--
作者：
C. Chaston;J. Bonnell;A. Halford;G. Reeves;D. Baker;C. Kletzing;J. Wygant
Van Allen探测器航天器和辐射带相对论电子损失气球阵列(Barrel)之间的磁性连接揭示了宽带Alfvénic涨落和增强的大气X射线韧致辐射的多时间尺度调制同时发生。利用Alfvénic涨落的性质，建立了电子回旋半径尺度场结构外辐射带的俯仰角散射模型。结果表明，这种散射可能导致电子在从几百keV到多MeV的能量范围内，在数小时量级的扩散时间尺度上传输到损耗锥中。这一过程可能解释了从气球观测到的大气X射线通量的调制，并构成了辐射带的重大损失过程。
A magnetic conjunction between Van Allen Probes spacecraft and the Balloon Array for Radiation‐belt Relativistic Electron Losses (BARREL) reveals the simultaneous occurrence of broadband Alfvénic fluctuations and multi‐timescale modulation of enhanced atmospheric X‐ray bremsstrahlung emission. The properties of the Alfvénic fluctuations are used to build a model for pitch angle scattering in the outer radiation belt on electron gyro‐radii scale field structures. It is shown that this scattering may lead to the transport of electrons into the loss cone over an energy range from hundreds of keV to multi‐MeV on diffusive timescales on the order of hours. This process may account for modulation of atmospheric X‐ray fluxes observed from balloons and constitute a significant loss process for the radiation belts.
用于 RBSP 相对论电子损耗的气球阵列 (BARREL)
影响因子：
10.3
作者：
Millan R
通讯作者：
Millan R