Testing the H-wave Hypothesis for the Origin of the IBEX Ribbon

Testing the H-wave Hypothesis for the Origin of the IBEX Ribbon
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检验 IBEX 带起源的 H 波假说

DOI:
10.1088/1742-6596/767/1/012007
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发表时间:
2016
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
Zönnchen
Zönnchen
中科院分区:
--
文献类型:
--
作者:
Fichtner;Scherer;Zönnchen

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星际边界探测器(IBEX)航天器绘制了整个天空的中性原子通量。因此,它是间接映射外日光层和(非常)本地星际介质的结构。在IBEX-Hi全天空图中,0.7至4.3千电子伏范围内高能中性原子(ENA)的微分通量的一个特别有趣的特征是所谓的带状物,即在整个天空的20至30度宽的带中增强2至3倍。在其他假设中,有人认为这条带状物可能与当地星际介质中的中性密度增强有关,即所谓的H波。通过采用的日光层的大尺度结构的分析模型,它表明,H波的情况下,带状形成导致的结果是完全一致的观察到的位置的带状在全天空的地图,以及在空间中的所有能量与IBEX-Hi检测。作为对以前工作的进一步扩展,并作为计算微分ENA通量的必要前提,内日鞘质子速度分布函数的演化是半解析计算的K-函数与本地确定的K-值。
The Interstellar Boundary Explorer (IBEX) spacecraft maps the neutral atom fluxes across the whole sky. Thereby it is indirectly mapping the structure of the outer heliosphere and the (very) local interstellar medium. A particularly interesting feature in the IBEX-Hi all-sky maps of the differential flux of Energetic Neutral Atoms (ENAs) in the 0.7 to 4.3 keV range is the so-called ribbon, ie a factor of two to three enhancement in a twenty to thirty degree wide band across the sky. Amongst other hypotheses it has been argued that this ribbon may be related to a neutral density enhancement, a so-called H-wave, in the local interstellar medium. By employing an analytical model of the large-scale structure of the heliosphere it is demonstrated that the H-wave scenario for the ribbon formation leads to results that are fully consistent with the observed location of the ribbon in the full-sky maps as well as in space at all energies detected with IBEX-Hi. As a further extension to previous work and as a necessary prerequisite for the computation of differential ENA fluxes, the evolution of the proton velocity distribution function in the inner heliosheath is semi-analytically computed in terms of a K-functions with locally determined K-values.
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