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arXiv 1310.6497astro-ph.SRphysics.comp-phphysics.flu-dynphysics.plasm-phphysics.space-ph
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星际弓形激波的存在及其性质

The existence and nature of the interstellar bow shock

L. Ben-Jaffel, M. Strumik, R. Ratkiewicz, J. Grygorczuk

摘要:

我们报告了一个新的诊断之间的两个不同状态的本地星际介质(LISM)在我们的太阳系附近使用的几个不同的和互补的观测约束的LISM,太阳风,和内日光层的敏感性研究。假设星际边界探测器(IBEX)He流参数为LISM,我们得到$\sim 2.7\pm0.2$ $μ$ G的强度和星际磁场指向远离银河系坐标$(28, 52)\pm 3^\circ$的方向,这是由旅行者1号和2号的现场等离子体测量和IBEX高能中性原子带拟合得到的。当对LISM He流使用双折射参数时,我们最近报道了相同的方向,但强度为$2.2\pm0.1$ $μ$ G。首先,我们注意到,与氦流,我们的解决方案是在预期的氢偏转平面(HDP)。相比之下,对于IBEX He流,溶液远离相应的HDP平面$\sim 20^{\circ}$。第二,行星际H I流速度的长期监测表明,在强Lyman- $α$天空背景发射线的多普勒频移的逆风处测量的值为$\sim 26$ km/s。因此,所有的诊断元素似乎都支持星际状态的氦流参数。在这一框架中,我们认为,可靠的歧视之间的超快,亚快,或超低速状态的星际流应基于大多数现有的原位和远程观测与全球建模的日光层。对于普遍接受的LISM电离率,我们表明,一个快速的星际弓激波应该是站在上游的太阳风顶。

英文摘要:

We report a new diagnostic between two different states of the local interstellar medium (LISM) near our solar system using a sensitivity study constrained by several distinct and complementary observations of the LISM, solar wind, and inner heliosphere. Assuming the Interstellar Boundary Explorer (IBEX) He flow parameters for the LISM, we obtain a strength of $\sim 2.7\pm0.2$ $μ$G and a direction pointing away from galactic coordinates $(28, 52)\pm 3^\circ$ for the interstellar magnetic field as resulting from fitting Voyager 1 & 2 in situ plasma measurements and IBEX energetic neutral atoms ribbon}. When using Ulysses parameters for the LISM He flow, we recently reported the same direction but a strength of $2.2\pm0.1$ $μ$G. First, we notice that with Ulysses He flow, our solution is in the expected hydrogen deflection plane (HDP). In contrast, for the IBEX He flow, the solution is $\sim 20^{\circ}$ away from the corresponding HDP plane. Second, the long-term monitoring of the interplanetary H I flow speed shows a value of $\sim 26$ km/s measured at upwind from the Doppler-shift in the strong Lyman-$α$ sky background emission line. All elements of diagnostics seem therefore to support Ulysses He flow parameters for the interstellar state. In that frame, we argue that reliable discrimination between superfast, subfast, or superslow states of the interstellar flow should be based on most existing in situ and remote observations used together with global modelling of the heliosphere. For commonly accepted LISM ionization rates, we show that a fast interstellar bow-shock should be standing-off upstream of the heliopause.

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