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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Evolving outer heliosphere: Large-scale stability and time variations observed by the Interstellar Boundary Explorer
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Evolving outer heliosphere: Large-scale stability and time variations observed by the Interstellar Boundary Explorer

机译：不断变化的外部日球层：星际边界探测器观测到的大规模稳定性和时间变化

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The first all-sky maps of Energetic Neutral Atoms (ENAs) from the Interstellar Boundary Explorer (IBEX) exhibited smoothly varying, globally distributed flux and a narrow "ribbon" of enhanced ENA emissions. In this study we compare the second set of sky maps to the first in order to assess the possibility of temporal changes over the 6 months between views of each portion of the sky. While the large-scale structure is generally stable between the two sets of maps, there are some remarkable changes that show that the heliosphere is also evolving over this short timescale. In particular, we find that (1) the overall ENA emissions coming from the outer heliosphere appear to be slightly lower in the second set of maps compared to the first, (2) both the north and south poles have significantly lower (～10-15%) ENA emissions in the second set of maps compared to the first across the energy range from 0.5 to 6 keV, and (3) the "knot" in the northern portion of the ribbon in the first maps is less bright and appears to have spread and/or dissipated by the time the second set was acquired. Finally, the spatial distribution of fluxes in the southernmost portion of the ribbon has evolved slightly, perhaps moving as much as 6° (one map pixel) equatorward on average. The observed large-scale stability and these systematic changes at smaller spatial scales provide important new information about the outer heliosphere and its global interaction with the galaxy and help inform possible mechanisms for producing the IBEX ribbon.
机译：来自星际边界探测器（IBEX）的第一批全能中性原子（ENAs）的全天候地图展示了变化平稳，分布全球的通量和增强ENA排放的窄带。在这项研究中，我们将第二组天空图与第一组天空图进行比较，以评估在每个月的天空视图之间6个月内时间变化的可能性。尽管两组地图之间的大比例结构总体上是稳定的，但仍有一些显着的变化表明，在这个短时标上，日光层也在演化。特别是，我们发现（1）与第一套地图相比，第二套地图中来自外部太阳圈的总ENA排放似乎要低一些;（2）北极和南极都明显更低（〜10-在能量范围为0.5到6 keV的第二组图中，ENA排放量与第一组图中的ENA排放量相比，相比之下，第一组中的ENA排放量更小;（3）在第一张图中，碳带北部的“结”较弱，看上去像在购买第二套时已经传播和/或消散。最后，带状体最南端的通量的空间分布已经略有变化，平均平均可能向赤道方向移动6°（一个地图像素）。观测到的大规模稳定性和这些在较小空间尺度上的系统变化，为有关外太阳圈及其与银河系的整体相互作用提供了重要的新信息，并有助于为产生IBEX色带的可能机制提供信息。

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