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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Diagnostic Simulations of the Lunar Sodium Tail and Bright Spot
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Diagnostic Simulations of the Lunar Sodium Tail and Bright Spot

机译：诊断模拟月球钠尾巴和亮点

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Numerical simulations of the lunar sodium tail and its bright sodium spot are presented. As an attempt to do reverse engineering to understand the lunar sodium exosphere, we simulated velocity distributions of the sodium tail and its bright spot that emerges in the night sky around new Moon phases. In this work, three physical sodium sources (i.e., photon-stimulated desorption [PSD], solar-wind ion sputtering [SIS], meteor impact vaporization [MIV]), the dust anisotropy effect reported by Lunar Atmosphere and Dust Environment Explorer (LADEE), three gravitational sources (i.e., the Moon, the Earth, and the Sun), and variable solar radiation pressure effects are considered. We simulated velocity distributions of the lunar bright spot considering different source contribution ratios and their temperatures in order to find the best initial parameters which can account for the important observed recessional velocity of 12.4 km/s by Mierkiewicz et al. (2006, https://doi.org/10.1029/2006GL027650). We found that the upper limits of Maxwellian temperatures of 1,800 K for the PSD and 2,500 K for the MIV and that the best contribution ratio of the three major sodium sources (i.e., PSD: SIS: MIV) is found at the case of 2: 1: 3 (i.e., MIV dominant). Based on the previous brightness observations of the bright spot, the total production rate of the lunar sodium is estimated to usually vary between 0.4 and 1.3 × 10~(22)/s. We introduce an interesting event in the lunar sodium tail, the Sodium Ring phenomena, which can occur transiently during the total solar eclipse due to the umbra and penumbra effects of the Earth.
机译：数值模拟的月球尾巴和钠它的明亮的钠现货。企图做逆向工程来理解月球钠外逸层,我们模拟速度分布的尾部钠及其明亮点在新出现的夜空月球阶段。来源(例如,photon-stimulated解吸(PSD),太阳风离子溅射(SIS),流星影响蒸发[MIV]),各向异性的灰尘影响报告的月球大气和尘埃环境资源管理器(LADEE),三个引力来源(例如,月球、地球和太阳),和变量影响太阳辐射压力考虑。考虑不同的月球亮点源的贡献比例和温度为了找到最好的初始参数占了重要的观察由Mierkiewicz后退的速度为12.4公里/秒et al . (2006),https://doi.org/10.1029/2006GL027650)。麦克斯韦的上限温度PSD的1800 K和2500 K MIV和最好的贡献比例的三个主要钠来源(例如,PSD:姐姐:MIV)发现的案例2:1:3(例如,MIV占主导地位)。观察的亮点,总产量的月球钠估计通常不同0.4和1.3×10 ~ (22)/ s。我们介绍一个有趣的事件在月球尾巴,钠钠环现象,可以在日全食发生瞬变由于本影和半影的影响地球。

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