Competition between acceleration and loss mechanisms of relativistic electrons during geomagnetic storms
Competition between acceleration and loss mechanisms of relativistic electrons during geomagnetic storms
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DOI：
10.1029/2004ja010437
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发表时间：
2004-04
影响因子：
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通讯作者：
D. Summers;C. Ma;T. Mukai
中科院分区：
文献类型：
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作者：
D. Summers;C. Ma;T. Mukai
[1] 我们定量地证明，地磁风暴是否会导致外层相对论性电子的增加或减少，取决于产生电子激励和损失的物理过程之间的竞争。我们构建了一个简化的一维电子能量分布模型，其中包含回旋加速器共振与哨声模式合唱相互作用产生的电子激励，以及组合等离子体波（特别是电磁离子回旋加速器波和等离子体层嘶嘶声）由于俯仰角散射到损失锥中而导致的电子损失。我们没有明确包括径向扩散，因为该模型适用于预计径向扩散较弱的区域 3 < L < 5。我们将合唱波振幅和电子损失率视为模型输入变量，并计算电子能量分布的解作为模型输出。发现事件期间电子通量增加或减少的程度受到波幅和电子损失率大小的敏感控制。
[1] We demonstrate quantitatively that whether a geomagnetic storm results in an increase or decrease of relativistic electrons in the outer zone depends on the competition between the physical processes producing the energization and loss of electrons. We construct a simplified one-dimensional model for the electron energy distribution incorporating electron energization by cyclotron resonant interaction with whistler-mode chorus, and electron losses due to pitch angle scattering into the loss cone by combined plasma waves ( in particular, electromagnetic ion cyclotron waves and plasmaspheric hiss). We do not include radial diffusion explicitly since the model applies to the region 3 < L < 5 where radial diffusion is expected to be weak. We treat the chorus wave amplitude and electron loss rate as model input variables and compute the solution for the electron energy distribution as the model output. The extent of the electron flux increase or decrease during the event is found to be sensitively controlled by the magnitudes of the wave amplitude and electron loss rate.