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The Heliosphere in Time

机译:时间的日光层

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Because of the dynamic nature of the interstellar medium, the Sun should have encountered a variety of different interstellar environments in its lifetime. As the solar wind interacts with the surrounding interstellar medium to form a heliosphere, different heliosphere shapes, sizes, and particle contents result from the different environments. Some of the large possible interstellar parameter space (density, velocity, temperature) is explored here with the help of global heliosphere models, and the features in the resulting heliospheres are compared and discussed. The heliospheric size, expressed as distance of the nose of the heliopause to the Sun, is set by the solar wind-interstellar pressure balance, even for extreme cases. Other heliospheric boundary locations and neutral particle results correlate with the interstellar parameters as well. If the H0 clouds identified in the Millennium Arecibo survey are typical of clouds encountered by the Sun, then the Sun spends ∼99.4% of the time in warm low density ISM, where the typical upwind heliosphere radii are up to two orders of magnitude larger than at present. Keywords Global heliosphere modeling - Time-dependent interstellar conditions
机译:由于星际介质的动态性质,太阳在其一生中应该遇到各种不同的星际环境。当太阳风与周围的星际介质相互作用形成一个日球层时,不同环境导致不同的日球层形状,大小和粒子含量。在这里,借助全局日球模型,探索了一些可能的大型星际参数空间(密度,速度,温度),并对所得日球的特征进行了比较和讨论。即使是在极端情况下,日光层的大小也可以用太阳风星际压力平衡来设定,即用绝经顶鼻子到太阳的距离来表示。其他太阳圈边界位置和中性粒子结果也与星际参数相关。如果在千年阿雷西博调查中确定的H 0 云是太阳遇到的典型云,那么太阳将约99.4%的时间花费在温暖的低密度ISM上,其中典型的迎风日球半径为比目前大两个数量级。关键词全球日球建模-时间相关的星际条件

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