Science. 1992 Oct 23;258(5082):635-40. doi: 10.1126/science.258.5082.635.
The first unambiguous full-disk radar mapping of Mercury at 3.5-centimeter wavelength, with the Goldstone 70-meter antenna transmitting and 26 antennas of the Very Large Array receiving, has provided evidence for the presence of polar ice. The radar experiments, conducted on 8 and 23 August 1991, were designed to image the half of Mercury not photographed by Mariner 10. The orbital geometry allowed viewing beyond the north pole of Mercury; a highly reflective region was clearly visible on the north pole during both experiments. This polar region has areas in which the circular polarization ratio (pt) was 1.0 to 1.4; values < approximately 0.1 are typical for terrestrial planets. Such high values of have hitherto been observed in radar observations only from icy regions of Mars and icy outer planet satellites.
首次利用 3.5 厘米波长的全圆盘雷达对水星进行了明确的全圆盘测绘，使用戈德斯通 70 米天线发射，26 个甚大阵天线接收，这为极地冰的存在提供了证据。这些雷达实验于 1991 年 8 月 8 日和 23 日进行，旨在对水手 10 号未拍摄到的水星的一半进行成像。轨道几何形状允许观测到水星北极以外的区域；在两次实验中，北极都清晰可见一个高反射区域。这个极地区域的部分地区的圆极化比（pt）为 1.0 到 1.4；对于类地行星来说，<大约 0.1 的值是典型的。迄今为止，这种高值仅在火星和冰态外行星卫星的冰区的雷达观测中观察到过。
