Optical Properties of Asteroid Surface Alteration

麦克法登博士的研究将分为两个阶段：（1）实验室 模拟太阳风影响的分析实验 小行星表面以及这些变化影响光谱的方式 反射率和其它光学性质。 (2)比较 实验室结果与遥感数据， 光谱反射率和偏振及光度散射 特性. 这将定义这些参数中的哪些是 太阳风轰击的诊断，并定义小行星 其特定光谱特征的表面条件 这是由于表面变化的影响。 了解小行星的化学和物理状态， 它们的进化史一直受到研究人员 无法令人满意地比较遥感测量结果 一些陨石样本和人造混合物 地球材料。 麦克法登博士的研究将检查 太阳风轰击对反射率的影响， 陨石样品和矿物混合物的光学性质。 这 将增进人们对 小行星及其可能的陨石类似物，并测试 目前解释小行星光谱的主要假设 反射率：小行星的表面 适当地由未改变的陨石物质。

Dr. McFadden's research will have two phases: (1) Laboratory analytical experiments simulating the effects of solar wind on asteroid surfaces and the way these changes affect spectral reflectance and other optical properties. (2) Comparison of the laboratory results with remote sensing data made with respect to spectral reflectance and polarimetric and photometric scattering properties. This will define which of these parameters are diagnostic of solar wind bombardment and also define asteroid surface conditions whose specific spectral signatures are attributable to the effects of surface alteration. Understanding the chemical and physical states of asteroids and their evolutionary history has been impeded by investigators' inability to satisfactorily compare remote sensing measurements with certain samples of meteorites and synthetic mixtures of terrestrial materials. Dr. McFadden's study will examine the effects of solar wind bombardment on the reflectance and other optical properties of meteorite samples and mineral mixtures. This will improve the understanding of the relationship between asteroids and their possible meteoritic analogues, and test the current primary assumption in interpretation of asteroid spectral reflectance: that the surfaces of asteroids are represented appropriately by unaltered meteoritic materials.