电荷交换与弹性碰撞施加的角散射对星际中性氢原子的影响
The Effect of Angular Scattering Imposed by Charge Exchange and Elastic Collisions on Interstellar Neutral Hydrogen Atoms
AI总结：
本研究通过 Monte Carlo 输运模拟评估外日鞘中电荷交换与弹性碰撞角散射的动量转移对 ISN H 原子及 IBEX-Lo 观测的影响，发现其不改变随太阳活动变化的经度位移，但所得有效辐射参数比 Lyα 观测值高约21–22%。
摘要：
在以往研究中，星际离子与中性（ISN）原子之间电荷交换和弹性碰撞中的角散射一直被假定为可忽略。本文中，我们利用 Monte Carlo 计算模拟 H 原子穿过外日鞘的输运，研究了与 H 原子角散射相关的动量转移。我们考虑了两种情形：外日鞘中 ISN H 原子与质子之间发生电荷交换和弹性碰撞时，分别存在动量转移和不存在动量转移。随后，我们模拟 ISN H 原子在日球层内部的输运，以模拟 IBEX-Lo 最低能量能段中观测到的计数率。我们针对存在和不存在动量转移的情形研究了辐射压对 ISN H 测量的影响，并将其与我们此前的发现进行比较。基于 ISN H 信号的经度位移，我们得到了 2009–2018 年的有效辐射参数（μ_eff，表示与辐射压相关的力相对于重力的比值）。存在和不存在动量转移的两种情形都按照太阳活动的变化再现了经度位移，这与我们此前的结果一致；并且二者给出了相近的 μ_eff 值，该值比基于 Lyα 观测得到的值大约 21–22%。
英文摘要：
Angular scattering in charge exchange and elastic collisions between interstellar ions and neutral (ISN) atoms has been assumed to be negligible in previous studies. Here, we investigated the momentum transfer associated with the angular scattering of H atoms using Monte Carlo calculations to simulate their transport through the outer heliosheath. We considered two cases where charge exchange and elastic collisions between ISN H atoms and protons occur with and without momentum transfer in the outer heliosheath. We then simulated the transport of ISN H atoms inside the heliosphere to simulate count rates observed in the lowest energy bin of IBEX-Lo. We studied the effect of radiation pressure on the ISN H measurements for the cases with and without momentum transfer and compared them with our previous findings. We found an effective radiation parameter ($μ_{\scriptsize\textrm{eff}}$, which represents for force associated with radiation pressure relative to gravity) for the years 2009-2018 based on the longitudinal shift of the ISN H signal. The two cases with and without momentum transfer reproduce the longitudinal shift in accordance with variations in solar activity, in agreement with our previous results, and they result in similar values for the $μ_{\scriptsize\textrm{eff}}$, which is $\sim21-22 \%$ larger than the value found based on Ly$α$ observations.
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