论文标题
欧罗巴光度法的区域研究
Regional study of Europa's photometry
论文作者
论文摘要
欧罗巴的表面在地质上很年轻，并显示了当前活动的迹象。从光度的角度研究它使我们对其物理状态进行了深入的了解。我们使用了来自Voyager成像科学系统的57张图像的集合和New Horizons的远程侦察成像仪，我们校正了几何元数据，并将每个像素投影以计算光度法信息（观察的反射率和几何形状）。我们研究了散布在欧罗巴表面的20个区域，并使用HAPKE辐射转移模型和一个贝叶斯框架估计了它们的光度法，以估计其微物理状态。我们发现，其中大多数与已经在全球范围内观察到的欧罗巴的明亮反向散射行为一致，表明存在空间风化的谷物成熟。但是，我们已经确定了非常明亮的区域，显示出狭窄的前向散射可能表明存在新鲜沉积物，这可能归因于最近的Cryovolcanism或喷气机。总体而言，我们表明欧罗巴表面的光度法比以前想象的要多样化，其微物理状态也是如此。
The surface of Europa is geologically young and shows signs of current activity. Studying it from a photometric point of view gives us insight on its physical state. We used a collection of 57 images from Voyager's Imaging Science System and New Horizons' LOng Range Reconnaissance Imager for which we corrected the geometric metadata and projected every pixel to compute photometric information (reflectance and geometry of observation). We studied 20 areas scattered across the surface of Europa and estimated their photometric behavior using the Hapke radiative transfer model and a Bayesian framework in order to estimate their microphysical state. We have found that most of them were consistent with the bright backscattering behavior of Europa, already observed at a global scale, indicating the presence of grains maturated by space weathering. However, we have identified very bright areas showing a narrow forward scattering possibly indicating the presence of fresh deposits that could be attributed to recent cryovolcanism or jets. Overall, we showed that the photometry of Europa's surface is more diverse than previously thought and so is its microphysical state.
