The Structure and Stability of Radiation Belt Electrons as Controlled by Wave-Particle Interactions
The Structure and Stability of Radiation Belt Electrons as Controlled by Wave-Particle Interactions
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波粒相互作用控制辐射带电子的结构和稳定性
DOI：
10.1007/978-94-010-1503-5_15
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
R. Thorne
中科院分区：
文献类型：
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作者：
R. Thorne
在高密度等离子体中捕获的高能电子的非绝热动力学主要由共振波-粒子相互作用控制。降水损失到大气中的速率与预期的俯仰角扩散是一致的，这是由于自然产生的哨声模式嘶嘶声的寄生共振散射。在磁暴的恢复阶段，这种发射增强，导致相对快速的电子沉淀，这足以在中等不变纬度的其他已知D区域电离源中占主导地位。然而，电子保持在弱俯仰角扩散的极限内，并且特征性地观察到的平衡俯仰角分布简单地由它们的反弹轨道平均扩散速率控制。典型的风暴后电子衰变时间弧几天，使增强槽区降水可能持续一个多星期，从而解释了长期的中纬度D区电离干扰测量使用无线电探测techniques.During地磁安静的条件下，高能电子演变成一个特征两区结构。这是由于在磁层亚暴期间，在外辐射区注入或加速的粒子向大气的散射损失和向内径向扩散之间的平衡。损耗由外等离子体层中的湍流俯仰角扩散和靠近地球的库仑散射控制。等离子体磁层内的径向扩散似乎是由大尺度磁层对流E场的亚暴波动驱动的。
The non-adiabatic dynamics of energetic electrons trapped within the high density plasmasphere are primarily controlled by resonant wave-particle interactions. Rates of precipitation loss to the atmosphere are consistent with anticipated pitch angle diffusion due to parasitic resonant scattering by naturally generated whistler mode hiss. During the recovery phase of magnetic storms such emissions intensify causing relatively rapid electron precipitation which is sufficient to dominate over other known D region ionization sources at middle invariant latitudes. The electrons nevertheless remain within the limit of weak pitch angle diffusion and the characteristically observed equilibrium pitch angle distribution is simply controlled by their bounce orbit averaged diffusion rate. Typical post storm electron decay times arc a few days so that enhanced slot region precipitation may persist for over a week; thus explaining the long duration of middle latitude D region ionization disturbances measured using radio probing techniques.During geomagnetically quiet conditions, energetic electrons evolve towards a characteristic two zone structure. This results from an eq uilibrium balance between scattering loss to the atmosphere and inward radial diffusion of particles injected or accelerated within the outer radiation zone during magnetospheric substorms. Losses are controlled by turbulent pitch angle diffusion in the outer plasmasphere and Coulomb scattering close to the Earth. Radial diffusion within the plasmasphere appears to be driven by sub storm fluctuations in the large scale magnetospheric convection E field.