Titan atmospheric composition by hypervelocity shock-layer analysis
Titan atmospheric composition by hypervelocity shock-layer analysis
复制标题
通过超高速激波层分析分析泰坦大气成分
DOI：
10.2514/3.243
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
E. Whiting
中科院分区：
文献类型：
--
作者：
H. Nelson;Chul Park;E. Whiting
卡西尼号任务是美国宇航局/欧空局的一个合作项目，其中包括向土卫六大气层部署探测器，其中特别注意了为分析土卫六大气层而计划在土卫六探测器上进行的冲击辐射计实验。本文给出了激波层分析的结果，表明泰坦探测器辐射计可以通过测量探测器进入200至400 km高度的高速段激波层发射的CN（紫色）辐射强度，成功地确定泰坦大气中主要物质（N2, CH4，可能还有Ar）的摩尔分数。结果表明，CN（紫外光）辐射的灵敏度使测定N2、CH4和Ar的摩尔分数分别达到0.015、0.003和0.01左右，大大优于目前土卫六大气组成的不确定性。
The Cassini Mission, a NASA/ESA cooperative project which includes a deployment of probe into the atmosphere of Titan, is described, with particular attention given to the shock radiometer experiment planned for the Titan probe for the analysis of Titan's atmosphere. Results from a shock layer analysis are presented, demonstrating that the mole fractions of the major species (N2, CH4, and, possibly Ar) in the Titan atmosphere can be successfully determined by the Titan-probe radiometer, by measuring the intensity of the CN(violet) radiation emitted in the shock layer during the high velocity portion of the probe entry between 200 and 400 km altitude. It is shown that the sensitivity of the CN(violet) radiation makes it possible to determine the mole fractions of N2, CH4, and Ar to about 0.015, 0.003, and 0.01, respectively, i.e., much better than the present uncertainties in the composition of Titan atmosphere.