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Pickup Ion Acceleration at the Termination Shock and in the Heliosheath

机译：终止电击和太阳鞘中的离子加速

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摘要

We discuss pickup ion acceleration and transport near the solar wind termination shock from the perspective of their spectral, spatial, and pitch-angle distributions. Our study is performed in the framework of a recently developed anisotropic transport model based on a Legendre polynomial expansion technique. Voyager 1 LECP angular distributions of 1 MeV protons, represented in the form of an expansion in spherical harmonics in the frame aligned with the measured interplanetary magnetic field, are used as benchmarks for our theory. We find the observed distributions consistent with our model predictions for particle acceleration and reflection at a highly oblique shock wave. It is shown that first-order (field aligned) anisotropy is a measure of shock obliquity while the second-order (transverse) anisotropy reflects the energy dependence of the particle scattering mean free path. We also discuss the role of enhanced scattering and momentum diffusion on the spectral properties of energetic charged particles.
机译：我们从其光谱，空间和俯仰角分布的角度讨论了太阳风终止冲击附近的拾取离子加速和传输。我们的研究是在基于勒让德多项式展开技术的最新开发的各向异性输运模型的框架内进行的。 1 MeV质子的Voyager 1 LECP角分布以与所测行星际磁场对准的框架中球谐函数的扩展形式表示，被用作我们理论的基准。我们发现观察到的分布与我们的模型预测相一致，该模型预测是在高度倾斜的冲击波下的粒子加速和反射。结果表明，一阶（场定向）各向异性是振动倾角的量度，而二阶（横向）各向异性反映了粒子散射平均自由程的能量依赖性。我们还将讨论增强的散射和动量扩散对高能带电粒子光谱特性的作用。

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