基于SLDEM2015数据的月球Aristarchus地区有效太阳辐照度和电场实时模拟

Real-time simulation of effective solar irradiance and electric field on the Aristarchus region based on SLDEM2015 data

以月球Aristarchus地区为例,基于覆盖全月的高精度数字高程模型(SLDEM2015)得到的月表坡度和方位角数据,计算2025–2045年之间研究区处于近日点夏至/冬至、远日点夏至/冬至4个时间点时,正午时刻的有效太阳辐照度.其次,基于充电电流平衡理论,计算4个时间点对应的平衡表面电势和垂向电场强度.研究发现地形、纬度、日月距离、季节对有效太阳辐照度和表面电场的分布特征具有重要的影响.此外,对比发现日月距离对研究区的有效太阳辐照和电场环境的影响比季节效应的影响更大.这可为将来无人和载人月球探测任务的时间选择、着陆点环境特征模拟、太阳能利用、月表尘埃环境预警预报等提供一定的支撑和依据.

Taking the Aristarchus region on the Moon as an example, the slope and azimuth of the lunar surface obtained from the high-precision digital elevation model(SLDEM2015) would be used to calculate the effective solar irradiance at noon from 2025 to 2045 when the Aristarchus region is at the perihelion summer/winter solstice and aphelion summer/winter solstice. Second, based on the current balance theory, the equilibrium surface potential and the vertical electric field are calculated. The results show that the topography, lunar latitude, Sun-Moon distance, and seasons have important effects on the distribution characteristics of effective solar irradiance, equilibrium surface potential, and vertical electric field. In addition, it is found that the distance between the Sun and the Moon has a considerable influence on the effective solar irradiation, equilibrium surface potential, and electric field than the seasonal variation. This can provide some support and basis for the time selection of unmanned and manned lunar exploration missions, simulation of landing site environment characteristics, use of solar energy, and early warning and prediction of lunar dust environment.