由IBEX现场取样的本地星际中性氢
Local Interstellar Neutral Hydrogen sampled in-situ by IBEX
摘要：
氢气是本地星际介质的主要成分。然而，由于电离和与日光层的相互作用，直接采样日光层内部的中性氢比采样深入日光层的本地星际中性氦更困难。在本文中，我们报告的第一个详细的分析直接采样中性氢从本地星际介质。我们确认，氢的到达方向是从本地氦分量的偏移。我们进一步报告了在IBEX观测的头两年中发现的穿透氢的变化。观测结果与氢的向外太阳辐射压力与向内引力的有效比值大于1（μ>1）相一致;观测到的局部星际氢通量的时间变化可以用太阳变率来解释。
英文摘要：
Hydrogen gas is the dominant component of the local interstellar medium. However, due to ionization and interaction with the heliosphere, direct sampling of neutral hydrogen in the inner heliosphere is more difficult than sampling the local interstellar neutral helium, which penetrates deep into the heliosphere. In this paper we report on the first detailed analysis of the direct sampling of neutral hydrogen from the local interstellar medium. We confirm that the arrival direction of hydrogen is offset from that of the local Helium component. We further report the discovery of a variation of the penetrating Hydrogen over the first two years of IBEX observations. Observations are consistent with hydrogen experiencing an effective ratio of outward solar radiation pressure to inward gravitational force greater than unity (μ>1); the temporal change observed in the local interstellar hydrogen flux can be explained with solar variability.
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