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Diagnosing the Neutral Interstellar Gas Flow at 1 AU with IBEX-Lo

机译：使用IBEX-Lo诊断1 AU时中性星际气流

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摘要

Every year in fall and spring the Interstellar Boundary Explorer (IBEX) will observe directly the interstellar gas flow at 1 AU over periods of several months. The IBEX-Lo sensor employs a powerful triple time-of-flight mass spectrometer. It can distinguish and image the O and He flow distributions in the northern fall and spring, making use of sensor viewing perpendicular to the Sun-pointing spin axis. To effectively image the narrow flow distributions IBEX-Lo has a high angular resolution quadrant in its collimator. This quadrant is employed selectively for the interstellar gas flow viewing in the spring by electrostatically shutting off the remainder of the aperture. The operational scenarios, the expected data, and the necessary modeling to extract the interstellar parameters and the conditions in the heliospheric boundary are described. The combination of two key interstellar species will facilitate a direct comparison of the pristine interstellar flow, represented by He, which has not been altered in the heliospheric boundary region, with a flow that is processed in the outer heliosheath, represented by O. The O flow distribution consists of a depleted pristine component and decelerated and heated neutrals. Extracting the latter so-called secondary component of interstellar neutrals will provide quantitative constraints for several important parameters of the heliosheath interaction in current global heliospheric models. Finding the fraction and width of the secondary component yields an independent value for the global filtration factor of species, such as O and H. Thus far filtration can only be inferred, barring observations in the local interstellar cloud proper. The direction of the secondary component will provide independent information on the interstellar magnetic field strength and orientation, which has been inferred from SOHO SWAN Ly-alpha backscattering observations and the two Voyager crossings of the termination shock.
机译：每年秋季和春季，星际边界浏览器（IBEX）都会在几个月内直接观测1 AU下的星际气流。 IBEX-Lo传感器采用了功能强大的三重飞行时间质谱仪。利用垂直于指向太阳的自旋轴的传感器，可以区分和成像北部秋季和春季的O和He流量分布。为了有效地对狭窄的流量分布进行成像，IBEX-Lo的准直仪具有高角度分辨率象限。通过静电关闭孔的其余部分，有选择地使用该象限来观察弹簧中的星际气流。描述了运行方案，预期数据以及提取星际参数和日球边界条件的必要模型。两种关键的星际物质的组合将有助于直接比较以He表示的原始星际流（在日球边界区域未发生变化）与在外部日鞘中处理的流（以O表示）的直接比较。流量分配包括原始成分耗尽，中性点减速和加热。提取星际中性的后一个所谓的次要分量将为当前全球日球模型中的日鞘相互作用的几个重要参数提供定量约束。找到次要分量的分数和宽度可得出物种总体过滤因子（例如O和H）的独立值。因此，除非在本地星际云中适当观察到，否则只能推断出过滤作用。次要分量的方向将提供有关星际磁场强度和方向的独立信息，该信息已从SOHO SWAN Ly-alpha背向散射观测结果和两个终止终端的Voyager穿越中得出。

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