用微流星体撞击方向性解释水星外逸层中黎明-黄昏的不对称性
Reconciling the dawn-dusk asymmetry in Mercury's exosphere with the micrometeoroid impact directionality
摘要：
结合动力学模型的尘埃从木星家族彗星和哈雷型彗星，我们表明，在水星的尘埃/流星体环境的季节性变化是负责生产黎明黄昏不对称的信使号航天器观测到的水星的外逸层。我们最近根据地面和空间测量结果校准的最新模型提供了前所未有的统计数据，使我们能够研究撞击水星表面的流星体的纵向和横向分布。我们预测，微流星体的影响蒸发源，预计将在水星的表面上进行显着的运动，在水星的办法远日点和向昼面时，地球正在接近太阳。
英文摘要：
Combining dynamical models of dust from Jupiter Family Comets and Halley-type Comets, we demonstrate that the seasonal variation of the dust/meteoroid environment at Mercury is responsible for producing the dawn-dusk asymmetry in Mercury's exosphere observed by the MESSENGER spacecraft. Our latest models, calibrated recently from ground-based and space-borne measurements, provide unprecedented statistics that enable us to study the longitudinal and latitudinal distribution of meteoroids impacting Mercury's surface. We predict that the micrometeoroid impact vaporization source is expected to undergo significant motion on Mercury's surface towards the nightside during Mercury's approach to aphelion and towards the dayside when the planet is approaching the Sun.
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