Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10701769 | Icarus | 2007 | 12 Pages |
Abstract
The Jâ=â3-2 rotational line of CO in Neptune has been measured using the heterodyne receiver B3 at the JCMT. The spectral resolution was 1.25 MHz and 25 tunings were used to cover a frequency range of almost 20 GHz. The measured line shape, encompassing both the broad absorption feature arising in the lower atmosphere and a narrow emission core from the upper stratosphere, indicates that the CO mole ratio is not uniform with altitude, with best-fit values of 2.2â0.4+0.6Ã10â6 in the upper stratosphere and 0.6±0.4Ã10â6 in the lower stratosphere and troposphere. The higher stratospheric abundance indicates that a dual, internal and external, origin of CO is most likely.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Brigette E. Hesman, Gary R. Davis, Henry E. Matthews, Glenn S. Orton,