The Lunar Dust Experiment (LDEX) on board the Lunar Atmosphere and Dust Environment Explorer (LADEE) mission orbited the Moon from 2014 September to 2015 April and observed a dynamic, permanently present dust cloud produced by continual meteoroid bombardment. For the latitudes observed by LDEX, the sporadic background contribution to the impacting dust flux is dominated by helion (HE), apex (AP), and antihelion (AH) sources oscillating with lunar phase. Using improved impact ejecta distributions, a three-dimensional model was implemented to estimate the inner and outer ejecta cone angles from LDEX plume measurements. Expanding upon this single-plume model and the derived ejecta cone angles, we implemented a global lunar model fitted to LDEX measurements of the sporadic background to constrain the product of meteoroid impactor fluxes and ejecta mass yield per source. We use the observed asymmetry between sunward and antisunward impactor fluxes to discuss the possible contributions of β-meteoroids, in addition to the HE and AH sporadic meteoroid sources. We find that if β-meteoroids are responsible for the day/night asymmetry, they must have an impact ejecta yield of at least 10³.

月球大气和尘埃环境探测器 (LADEE) 上的月球尘埃实验 (LDEX) 于 2014 年 9 月至 2015 年 4 月围绕月球运行，并观察到由持续流星体轰击产生的动态、永久存在的尘埃云。对于 LDEX 观测到的纬度，对影响尘埃通量的零星背景贡献主要由与月相振荡的日星 (HE)、顶点 (AP) 和反日点 (AH) 源主导。使用改进的撞击喷射物分布，实施了一个三维模型，以通过 LDEX 羽流测量来估计内部和外部喷射物锥角。扩展这个单羽流模型和导出的喷射锥角，我们实施了一个适合于零星背景的 LDEX 测量值的全球月球模型，以限制流星体撞击物通量的乘积和每个源的喷射物质量产量。我们使用观察到的向日和反向日撞击通量之间的不对称性来讨论β-流星体，以及 HE 和 AH 零星流星体源。我们发现，如果β-流星体是造成昼夜不对称的原因，那么它们的撞击喷射量必须至少为 10 ³。