Science. 1979 Jul 6;205(4401):76-9. doi: 10.1126/science.205.4401.76.
Several photometric measurements of Venus made from the Pioneer Venus orbiter and probes indicate that solar near-ultraviolet radiation is being absorbed throughout much of the main cloud region, but little above the clouds or within the first one or two optical depths. Radiative transfer calculations were carried out to simulate both Pioneer Venus and ground-based data for a number of proposed cloud compositions. This comparison rules out models invoking nitrogen dioxide, meteoritic material, and volatile metals as the source of the ultraviolet absorption. Models involving either small ( approximately 1 micrometer) or large ( approximately 10 micrometers) sulfur particles have some serious difficulties, while ones invoking sulfur dioxide gas appear to be promising.
先驱者金星号轨道飞行器和探测器对金星进行的几次光度测量表明，太阳近紫外线辐射在大部分主云区都被吸收了，但在云层上方或在第一到两个光深范围内几乎没有吸收。进行了辐射传输计算，以模拟先驱者金星号和一些提议的云组成的基于地面的数据。这种比较排除了将二氧化氮、陨石物质和挥发性金属作为紫外线吸收源的模型。涉及小（约 1 微米）或大（约 10 微米）硫粒子的模型存在一些严重的困难，而涉及二氧化硫气体的模型似乎很有前途。
