The analysis of solar wind material implanted within lunar soil has provided significant insight into the makeup and evolutionary history of the solar wind and, by extension, the Sun and protosolar nebula. These analyses often rely on the tacit assumption that the Moon has served as an unbiased recorder of solar wind composition over its 4.5 billion yr lifetime. Recent work, however, has shown that for a majority of its lifetime, the Moon has possessed a dynamo that generates a global magnetic field with surface field strengths of at least 5 μT. In turn, the presence of such a field has been shown to significantly alter the lunar–solar wind interaction via the formation of a lunar “paleomagnetosphere.” This paleomagnetosphere has implications for the flux of solar wind minor ions to the lunar surface and their subsequent implantation in lunar soil grains. Here we use a three-dimensional hybrid plasma model to investigate the effects of the lunar paleomagnetosphere on the dynamics and precipitation of solar wind minor ions to the lunar surface. The model results show that the lunar paleomagnetosphere can suppress minor ion fluxes to the lunar surface by more than an order of magnitude and strongly fractionates the precipitating solar wind in a complex, nonlinear fashion with respect to both the minor ion charge-to-mass ratio and the surface paleomagnetic field strength. We discuss the implications of these results with respect to both the analysis of trapped material in lunar grains and the semiquantitative ⁴⁰Ar/³⁶Ar antiquity indicator for lunar soils.

月球土壤中植入太阳风物质的分析提供了显著洞察化妆和太阳风的进化史，并推而广之，太阳和原太阳星云。这些分析往往依靠默契的假设，月球一直担任太阳风组成了它的4.5十亿年寿命的公正记录。最近的研究工作，但是，已经表明，对于大多数其寿命，月球已具备，生成具有至少5的表面的场强的全局磁场的发电机μT.反过来，这样的场的存在已经显示出显著改变经由月球的形成月球太阳风相互作用“paleomagnetosphere”。此paleomagnetosphere具有用于太阳风次要离子向月球表面的通量和在月球土粒子及其随后的植入的影响。在这里，我们使用一个三维混合等离子体模型来研究上的动态和太阳风次要离子的沉淀在月球表面月球paleomagnetosphere的影响。模拟结果表明，月球paleomagnetosphere可以由多于一个数量级的抑制较小的离子通量在月球表面，并强烈分馏沉淀太阳风在一个复杂的，非线性的方式相对于两个次要离子电荷 - 质量比和表面古地磁场强。用于月球土壤的⁴⁰ Ar/ ³⁶ Ar 古代指示剂。