欧罗巴photometry的区域研究
Regional study of Europa's photometry
摘要：
木卫二的表面在地质上是年轻的，并显示出当前活动的迹象。从光度学的角度研究它可以让我们了解它的物理状态。我们使用了来自旅行者号成像科学系统和新地平线号长距离侦察成像仪的57张图像集，我们对其几何元数据进行了校正，并投影每个像素以计算光度信息（观察的反射率和几何形状）。我们研究了20个地区分散在欧罗巴的表面，并估计其光度的行为，使用Hapke辐射转移模型和贝叶斯框架，以估计其微物理状态。我们发现，其中大多数与木卫二的明亮后向散射行为一致，已经在全球范围内观察到，表明存在通过空间风化而成熟的颗粒。然而，我们已经确定了非常明亮的区域，显示出狭窄的前向散射，这可能表明存在新的沉积物，这些沉积物可能归因于最近的冰火山活动或喷流。总的来说，我们发现木卫二表面的测光比以前认为的更加多样化，其微物理状态也是如此。
英文摘要：
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.
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