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arXiv 1604.05079astro-ph.SR
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由于太阳风结构引起的IBEX带的能量依赖位置

The energy-dependent position of the IBEX ribbon due to the solar wind structure

Paweł Swaczyna, Maciej Bzowski, Justyna M. Sokół

备注：
14 pages, 8 figures, 1 table, v3: corrected caption to Figure 3
发表信息：
ApJ 827 (2016), 71
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摘要：

高能中性原子（ENA）的观测允许在日光层和邻近的本地星际介质的等离子体条件的远程研究。IBEX的第一个结果揭示了天空中ENA强度的弧形增强，称为丝带。在IBEX发射之前，日光层模型中并不期望有带状物。其中一个被提出的解释是二次ENA发射的机制。带状物在沿其圆周的相对强度和位置中揭示了能量依赖性结构。也就是说，在0.7-4.3 keV的能量范围内，带的几何中心系统地变化约10 $^\circ$。在这里，我们通过分析模型表明，这种效果是一个后果的太阳纬度结构的太阳风反映在二次ENA。随着最近测得的距离带源刚刚超出太阳顶，我们的研究结果支持连接的带状与本地星际磁场的二次ENA发射的机制。然而，最高IBEX能量通道中的中心偏移的幅度在观测中比从建模中预期的要大得多。这可能是由于另一个目前尚未认识到的ENA生成过程。

英文摘要：

Observations of energetic neutral atoms (ENAs) allow for remote studies of the plasma condition in the heliosphere and the neighboring local interstellar medium. The first IBEX results revealed an arc-like enhancement of the ENA intensity in the sky, known as the ribbon. The ribbon was not expected from the heliospheric models prior to the IBEX launch. One of the proposed explanations of the ribbon is the mechanism of the secondary ENA emission. The ribbon reveals energy-dependent structure in the relative intensity along its circumference and in the position. Namely, the ribbon geometric center varies systematically by about 10$^\circ$ in the energy range 0.7-4.3 keV. Here, we show by analytic modeling that this effect is a consequence of the helio-latitudinal structure of the solar wind reflected in the secondary ENAs. Along with a recently measured distance to the ribbon source just beyond the heliopause, our findings support the connection of the ribbon with the local interstellar magnetic field by the mechanism of the secondary ENA emission. However, the magnitude of the center shift in the highest IBEX energy channel is much larger in the observations than expected from the modeling. This may be due to another, not currently recognized, process of ENA generation.

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