即将进行的SMEX飞行任务IBEX对中性星际氘的探测能力
Detectability of neutral interstellar deuterium by a forthcoming SMEX mission IBEX
摘要：
背景：即将到来的NASA SMEX任务IBEX对星际中性D探测的可行性进行侦察。目的：通过数值模拟研究中性星际D在地球轨道上的绝对密度和通量，并检验IBEX对它的探测能力。研究方法：模拟是使用华沙三维时间相关的测试粒子模型的中性星际气体在内部日光层，特别是适应的情况下D，和国家的最先进的模型的电离场和辐射压力。模拟返回了在太阳活动周期中星际D在地球位置的密度、体积速度和通量。特别注意了与IBEX计划业务相对应的时间间隔。结果：模拟预测在地球轨道上的D丰度相对于终止激波处的丰度有很大的提高。除了每年9月至11月间的一小段时间外，IBEX的D原子能量将在其Lo仪器的能量灵敏度范围内。由于IBEX的特殊观测几何结构，每年将有一次机会在地球接近黄道经度136度时（即2月）搜索I/S D。假设TS中D的丰度与本地云中的相同，等于1.56E-5，TS中H的密度为0.11/cm 2/s，则可以得到预期的相对通量约为0.015/cm 2/s，这对应于本地绝对通量约为0.007/cm 2/s。期望通量对太阳活动周位相的依赖性较弱。在终止冲击波的氘的密度成比例的比例，并仅微弱地依赖于体积速度和温度的气体在这一地区的流量。
英文摘要：
Context: Reconnaissance of feasibility of detection of interstellar neutral D by the forthcoming NASA SMEX mission IBEX. Aims: To investigate by numerical simulations the absolute density and flux at Earth orbit of neutral interstellar D and to check its detectability by IBEX. Methods: The simulations were performed with the use of the Warsaw 3D time-dependent test-particle model of neutral interstellar gas in the inner heliosphere, specially adapted to the case of D, and of the state-of-the-art models of the ionization field and radiation pressure. The modeling returned density, bulk velocity, and flux of interstellar D along at the Earth locations during the solar cycle. Particular attention was paid to the time interval corresponding to the planned operations of IBEX. Results: Simulations predict a large enhancement of D abundance at Earth orbit with respect to the abundance at the termination shock. The energy of the D atoms at IBEX will be within the energetic sensitivity band of its Lo instrument except a short time interval between September and November each year. Because of the specific observing geometry of IBEX, there will be one opportunity each year to search for I/S D, when Earth is near ecliptic longitude 136 deg, i.e. in February. Assuming the TS abundance of D identical as in the Local Cloud equal to 1.56E-5, and the density of H at TS 0.11/cm2/s one obtains the expected relative flux about 0.015/cm2/s, which corresponds to the local absolute flux about 0.007/cm2/s. The dependence of the expected flux on the phase of solar cycle is relatively weak. The flux scales proportionally to the density of deuterium at the termination shock and depends only weakly on the bulk velocity and temperature of the gas in this region.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
