Harmon J K, Slade M A
Science. 1992 Oct 23;258(5082):640-3. doi: 10.1126/science.258.5082.640.
A random-code technique has been used at Arecibo to obtain delay-Doppler radar images of the full disk of Mercury. Anomalously bright features were found at the north and south poles. The north polar feature is oblong (4 degrees by 8 degrees ) and offset from the pole. The smaller south polar feature is mostly confined to the floor of the crater Chao Meng-Fu. The polar locations and radar properties of these features indicate that they may be produced by volume scattering in ice. The images also reveal a variety of more subdued reflectivity features ranging in size from hundreds to thousands of kilometers; some of these appear to have an impact origin.
阿雷西博天文台采用随机编码技术获取了水星整个圆盘的延迟多普勒雷达图像。在水星的北极和南极发现了异常明亮的特征。北极的特征呈长方形（4度×8度），且偏离极点。较小的南极特征大多局限于朝孟俯撞击坑的底部。这些特征的极地位置和雷达特性表明，它们可能是由冰中的体散射产生的。这些图像还揭示了各种更为柔和的反射率特征，其大小从数百公里到数千公里不等；其中一些似乎起源于撞击。
