根据电子束拾取离子观测在终止激波处中性星际氢的密度
Density of neutral interstellar hydrogen at the termination shock from Ulysses pickup ion observations
摘要：
通过重新评估一个为期13个月的延伸近5 AU接近黄道的太阳极小期后，ECOSWICS H拾取离子测量，本文提出了一个中性星际H密度的测定在太阳风终止冲击和影响的密度和电离度的氢在LIC。中性星际氢在终止激波的密度是由接近远日点处分布函数截止点的局部拾取离子产生率确定的。如在逆风轴的分析处理和通过在观察者位置处的拾取离子产生率的动力学建模中所示，随着电离率、辐射压力和粒子行为的建模的变化，这种分析被证明对这些参数和建模中的不确定性是非常鲁棒的。利用当前日光层参数进行分析，得出终端激波处的H密度等于$0.087\pm0.022$ cm $^{-3}$，包括观测和模拟的不确定性。
英文摘要：
By reevaluating a 13-month stretch of Ulysses SWICS H pickup ion measurements near 5 AU close to the ecliptic right after the previous solar minimum, this paper presents a determination of the neutral interstellar H density at the solar wind termination shock and implications for the density and ionization degree of hydrogen in the LIC. The density of neutral interstellar hydrogen at the termination shock was determined from the local pickup ion production rate as obtained close to the cut-off in the distribution function at aphelion of Ulysses. As shown in an analytical treatment for the upwind axis and through kinetic modeling of the pickup ion production rate at the observer location, with variations in the ionization rate, radiation pressure, and the modeling of the particle behavior, this analysis turns out to be very robust against uncertainties in these parameters and the modeling. Analysis using current heliospheric parameters yields the H density at the termination shock equal to $0.087\pm0.022$ cm$^{-3}$, including observational and modeling uncertainties.
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