Heliospheric asymmetries due to the action of the interstellar magnetic field

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• 作者：Nikolai V. Pogorelov ; Jacob Heerikhuisen ; Gary P. Zank ; Jeremy J. Mitchell ; Iver H. Cairns
• 关键词：Solar wind ; Termination shock ; ISM ; kinematics and dynamics ; ISM ; magnetic fields ; Radio emission
• 刊名：Advances in Space Research
• 出版年：2009
• 出版时间：1 December 2009
• 年：2009
• 卷：44
• 期：11
• 页码：1337-1344
• 全文大小：545 K

文摘

We discuss the asymmetry of the heliospheric discontinuities obtained from the analysis of 3D modeling of the solar wind (SW) interaction with local interstellar medium (LISM). The flow of charged particles is governed by the ideal MHD equations and the flow of neutral particles is described by the Boltzmann equation. The emphasis is made on the asymmetries of the termination shock (TS) and the heliopause under the combined action of the interstellar and interplanetary magnetic fields (ISMF and IMF) in the presence of neutral hydrogen atoms whose transport through the heliosphere is modeled kinetically, using a Monte Carlo approach. We show that the deflection of neutral hydrogen flow from its original direction in the unperturbed LISM is highly anisotropic and evaluate a possible angle between the hydrogen deflection plane measured in the SOHO SWAN experiment and the plane containing the ISMF and LISM velocity vectors for different ISMF strengths. It is shown that the ISMF of a strength greater than 4 μG can account for the 10 AU difference in the TS heliocentric difference observed during its crossing by the Voyager 1 and Voyager 2 spacecraft, which however results in a larger discrepancy between the calculated and observed velocity distributions. The effect of a strong ISMF on the distribution of plasma quantities in the inner heliosheath and on 2–3 kHz radio emission is discussed.