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首页> 外文OA文献 >Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en-route to Pluto. Comparison of its Forbush decreases at 1.4, 3.1 and 9.9 AU:Interplanetary coronal mass ejection
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Interplanetary coronal mass ejection observed at STEREO-A, Mars, comet 67P/Churyumov-Gerasimenko, Saturn, and New Horizons en-route to Pluto. Comparison of its Forbush decreases at 1.4, 3.1 and 9.9 AU:Interplanetary coronal mass ejection

机译：在去往冥王星的STEREO-A，火星，67P / Churyumov-Gerasimenko彗星，土星和新视野号观测到的行星际日冕物质抛射。在1.4、3.1和9.9 AU时其前冲的比较：行星际冠状物质抛射

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We discuss observations of the journey throughout the Solar System of a large interplanetary coronal mass ejection (ICME) that was ejected at the Sun on 14 October 2014. The ICME hit Mars on 17 October, as observed by the Mars Express, MAVEN, Mars Odyssey and MSL missions, 44 hours before the encounter of the planet with the Siding-Spring comet, for which the space weather context is provided. It reached comet 67P/Churyumov-Gerasimenko, which was perfectly aligned with the Sun and Mars at 3.1 AU, as observed by Rosetta on 22 October. The ICME was also detected by STEREO-A on 16 October at 1 AU, and by Cassini in the solar wind around Saturn on the 12 November at 9.9 AU. Fortuitously, the New Horizons spacecraft was also aligned with the direction of the ICME at 31.6 AU. We investigate whether this ICME has a non-ambiguous signature at New Horizons. A potential detection of this ICME by Voyager-2 at 110-111 AU is also discussed. The multi-spacecraft observations allow the derivation of certain properties of the ICME, such as its large angular extension of at least 116°, its speed as a function of distance, and its magnetic field structure at four locations from 1 to 10 AU. Observations of the speed data allow two different solar wind propagation models to be validated. Finally, we compare the Forbush decreases (transient decreases followed by gradual recoveries in the galactic cosmic ray intensity) due to the passage of this ICME at Mars, comet 67P and Saturn.
机译：我们讨论了2014年10月14日在太阳上弹出的大型行星际日冕物质抛射（ICME）在整个太阳系中的旅行观测结果。如Mars Express，MAVEN和Mars Odyssey所观察到的那样，ICME于10月17日袭击了火星和MSL任务，在行星与Siding-Spring彗星相遇之前的44小时，为此提供了空间天气背景。罗塞塔在10月22日观察到，它到达了67P / Churyumov-Gerasimenko彗星，与3.1 AU的太阳和火星完全对准。 10月16日，STEREO-A在1 AU探测到了ICME，11月12日在9.9 AU在探测到土星周围的太阳风中，卡西尼号也探测到了ICME。幸运的是，“新视野”号航天器也与ICME的方向一致，为31.6 AU。我们调查该ICME在New Horizo​​ns是否具有明确的签名。还讨论了Voyager-2在110-111 AU处对该ICME的潜在检测。多航天器的观测值可以推导ICME的某些特性，例如其至少116°的大角度延伸，其速度与距离的关系以及在1至10 AU的四个位置处的磁场结构。对速度数据的观察可以验证两个不同的太阳风传播模型。最后，我们比较了由于该ICME在火星，67P彗星和土星上的通过而导致的Forbush下降（瞬态下降，然后银河系宇宙射线强度逐渐恢复）。

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