The abundances of ammonia in the atmospheres of Jupiter,Saturn, and Titan |
| |
| Authors: | Jerry H Woodman L Trafton Tobias Owen |
| |
| Institution: | 1. McDonald Observatory, University of Texas, Fort Davis, Texas 79734, USA;2. Department of Astronomy, University of Texas at Austin, Austin, Texas 78712, USA;3. Department of Earth and Space Sciences, SUNY at Stony Brook, Stony Brook, New York 11794, USA |
| |
| Abstract: | An investigation of low-resolution ratio spectra of Jupiter, Saturn, and Titan in the region 5400–6500 Å has permitted new evaluations of ammonia absorption bands. The distribution of ammonia over the disk of Jupiter is very inhomogeneous. The carbon-to-nitrogen ratio is distinctly different from the solar value, but this is probably a result of uneven mixing of methane and ammonia, as suggested previously by Kuiper, rather than a compositional anomaly. The abundance of ammonia on Saturn also shows spatial variations, but appears constant in time over a 3-yr period. Two weak, unidentified absorptions were discovered in the red region of Titan's spectrum, in the absence of any detectable ammonia. The new upper limit is ηN < 120 cm-am. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
