标题： 星际介质和太阳风电离氦的影响对太阳风与局部星际介质相互作用的作用 显示英文标题

标题： Effects of interstellar and solar wind ionized helium on the interaction of the solar wind with the local interstellar medium

摘要： 太阳正在穿越一个温暖（温度约为$\sim$6500 K）且部分电离的局部星际云（LIC），其速度为$\sim$26 km/s。 最近对LIC电离程度的测量（Wolff等人，1999年）表明，太阳附近的星际氦大约有30-40%被电离，而星际氢的电离程度较低。 因此，星际氦离子可以贡献高达50%的电离星际物质总动力压力。 到目前为止，在现有的日球层界面模型中都忽略了这些星际氦离子。 本文提出了一个新模型的结果，该模型考虑了星际氦离子与太阳风之间的相互作用。 利用这个模型的结果，我们发现相比于忽略$He$离子的模型结果，日球层顶、终止激波和弓激波更靠近太阳。 星际氦离子的影响部分被太阳风α粒子所抵消，我们的新模型也考虑了这些α粒子。 最后，我们将新模型应用于限制终止激波可能的位置。 显示英文摘要

摘要： The Sun is moving through a warm ($\sim$6500 K) and partly ionized local interstellar cloud (LIC) with a velocity of $\sim$26 km/s. Recent measurements of the ionization of the LIC (Wolff et al., 1999) suggest that interstellar helium in the vicinity of the Sun is 30-40 % ionized, while interstellar hydrogen is less ionized. Consequently, interstellar helium ions contribute up to 50% of the total dynamic pressure of the ionized interstellar component. Up to now interstellar helium ions have been ignored in existing models of the heliospheric interface. In this paper we present results of a new model of the solar wind interaction with the interstellar medium, which takes into account interstellar helium ions. Using results of this model we find that the heliopause, termination and bow shocks are closer to the Sun when compared to the model results that ignore $He$ ions. The influence of interstellar helium ions is partially compensated by solar wind alpha particles, which are taken into account in our new model as well. Finally, we apply our new model to place constraints on the plausible location of the termination shock.