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首页> 外文会议>Proceedings of the 32nd International Cosmic Ray Conference >Three-dimensional anisotropic transport simulations: a parameter study for the interpretation of multi-spacecraft solar energetic particle observations
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Three-dimensional anisotropic transport simulations: a parameter study for the interpretation of multi-spacecraft solar energetic particle observations

机译：三维各向异性输运模拟：解释多航天器太阳高能粒子观测的参数研究

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摘要

The missions STEREO A/B with large separation distances, together with ACE, SOHO, and WIND near Earth, provide presently the unique opportunity to observe solar energetic particles (SEP) over a large range of solar longitudes and latitudes in the inner heliosphere. It is evident from these observations that temporal and directional characteristics of solar energetic particles strongly depend on the location of the spacecraft relative to the source at the Sun. Our three-dimensional model of SEP propagation incorporates anisotropic pitch-angle scattering by magnetic inhomogeneities in the solar wind, focusing, streaming along the large-scale magnetic field, adiabatic energy losses and pitch-angle-dependent diffusion perpendicular to the magnetic field. We report the results of a parameter study of SEP time profiles, anisotropy and pitch-angle distribution as a function of different propagation parameters, angular and radial distances from the source and the source size. A comparison of the simulation results with multi-spacecraft observations allows to diagnose the propagation conditions in interplanetary space.
机译：具有较大间隔距离的STEREO A / B任务，以及ACE，SOHO和WIND在地球附近，目前提供了独特的机会，可在内部太阳圈中的大范围太阳经度和纬度上观测太阳高能粒子（SEP）。从这些观察结果可以明显看出，太阳高能粒子的时间和方向特性在很大程度上取决于航天器相对于太阳源的位置。我们的SEP传播的三维模型结合了太阳风中磁不均匀性引起的各向异性俯仰角散射，聚焦，沿大型磁场流，绝热能量损失以及垂直于磁场的俯仰角相关扩散。我们报告了SEP时间剖面，各向异性和俯仰角分布的参数研究的结果，这些参数是不同传播参数，距源的角度和径向距离以及源尺寸的函数。将模拟结果与多航天器观测结果进行比较，可以诊断行星际空间中的传播条件。

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