用 SPECTRUM 软件建立高能带电粒子输运的数值模型:一般方法和场离散化引起的人为效应

J. A. Guzman, V. Florinski, G. Tóth, S. Sharma, B. van der Holst, M. Opher
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引用次数: 0

摘要

测试粒子模拟是磁层和太阳物理学研究的重要工具。在本文中,我们介绍了空间等离子体和非结构化网格上的高能带电粒子传输(SPECTRUM)软件,它是在任意天体物理环境中执行这类模拟的一种新工具,可以通过分析或数值(即在网格上)进行指定。我们讨论了 SPECTRUM 与网格磁流体动力学背景的接口,包括块自适应树太阳风 Roe 型上风方案(BATS-R-US)代码的输出,并对其进行了基准测试。我们还研究了场离散化对确定性和随机粒子运动的影响,重点是空间科学应用,结论是离散化误差通常会增强集合的扩散行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Modeling of Energetic Charged-particle Transport with SPECTRUM Software: General Approach and Artificial Effects due to Field Discretization
Test-particle simulations are an important tool for magnetospheric and heliophysics research. In this paper, we present the Space Plasma and Energetic Charged particle TRansport on Unstructured Meshes (SPECTRUM) software as a novel tool for performing these types of simulations in arbitrary astrophysical environments, specified either analytically or numerically (i.e., on a grid). We discuss and benchmark SPECTRUM’s interface with meshed magnetohydrodynamic backgrounds, including output from the Block Adaptive Tree Solar-wind Roe-type Upwind Scheme (BATS-R-US) code. We also investigate the effects of field discretization on both deterministic and stochastic particle motion, with emphasis on space science applications, concluding that the discretization error typically enhances the diffusive behavior of the ensemble.
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