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首页> 外文期刊>The Astrophysical journal >PROBING HELIOSPHERIC ASYMMETRIES WITH AN MHD-KINETIC MODEL
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PROBING HELIOSPHERIC ASYMMETRIES WITH AN MHD-KINETIC MODEL

机译：用MHD动力学模型探测日球不对称

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摘要

New solar wind data from the Voyager 1 and Voyager 2 spacecraft, together with the SOHO SWAN measurements of the direction in which neutral hydrogen enters into the inner heliosheath and neutral helium measurements provided by multiple observations, are expected to provide more reliable constraints on the ionization ratio of the local interstellar medium (LISM) and the direction and magnitude of the interstellar magnetic field (ISMF). In this Letter we use the currently most sophisticated numerical model of the heliospheric interface, which is based on an MHD treatment of the ion flow and kinetic modeling of neutral particles, to analyze an ISMF-induced asymmetry of the heliosphere in the presence of the interplanetary magnetic field and neutral particles. It is shown that secondary hydrogen atoms modify the LISM properties leading to its shock-free deceleration at the heliopause. We determine the deflection of hydrogen atoms from their original trajectory in the unperturbed LISM and show that it occurs not only in the plane defined by the ISMF and LISM velocity vectors, but also, to a lesser extent, perpendicular to this plane. We also consider the possibility of using 2-3 kHz radio emission data to further constrain the ISMF direction.
机译：Voyager 1和Voyager 2航天器的新太阳风数据，以及中性氢进入内部日鞘的方向的SOHO SWAN测量以及多次观测提供的中性氦测量，有望为电离提供更可靠的约束。局部星际介质的比率（LISM）和星际磁场的方向和大小（ISMF）。在这封信中，我们使用当前最复杂的日球层界面数值模型，该模型基于离子流的MHD处理和中性粒子的动力学建模，以分析在存在行星际情况下ISMF引起的日球不对称性磁场和中性粒子。结果表明，仲氢原子修饰了LISM性质，导致其在绝经期无冲击地减速。我们确定了氢原子在不受干扰的LISM中从其原始轨迹的偏转，并表明它不仅发生在由ISMF和LISM速度矢量定义的平面中，而且在较小的程度上垂直于该平面发生。我们还考虑了使用2-3 kHz无线电发射数据来进一步限制ISMF方向的可能性。

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