一个改进的星际局部磁场解析模型：可压缩性的推广
An Improved Analytical Model of the Local Interstellar Magnetic Field: The Extension to Compressibility
摘要：
先前发表的关于太阳层顶附近局部星际磁场的磁流体动力学分析模型（Röken等人，2015年）从不可压缩扩展到可压缩，但主要是亚音速流，同时考虑等温和绝热状态方程。导出并讨论了密度和流速的精确表达式和适当的近似。这些表达式除了满足定常诱导方程外，还满足沿流线的动量平衡方程。相应的，仍然准确的解析磁场解决方案的实际用途进行评估，通过比较它定量的结果从一个完全自洽的磁流体动力学模拟的星际磁场披覆在太阳层顶。
英文摘要：
A previously published analytical magnetohydrodynamic model for the local interstellar magnetic field in the vicinity of the heliopause (Röken et al. 2015) is extended from incompressible to compressible, yet predominantly subsonic flow, considering both isothermal and adiabatic equations of state. Exact expressions and suitable approximations for the density and the flow velocity are derived and discussed. In addition to the stationary induction equation, these expressions also satisfy the momentum balance equation along stream lines. The practical usefulness of the corresponding, still exact analytical magnetic field solution is assessed by comparing it quantitatively to results from a fully self-consistent magnetohydrodynamic simulation of the interstellar magnetic field draping around the heliopause.
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