Variability of Neptune's 12.2-micron ethane emission feature

Details Variability of Neptune's 12.2-micron ethane emission feature Variability of Neptune's 12.2-micron ethane emission feature

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...99..347h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 99, no. 2, p. 347-352.

Computer Science

9

Atmospheric Composition, Atmospheric Temperature, Ethane, Neptune Atmosphere, Reflectance, Infrared Spectra, Methane, Stratosphere

Scientific paper

It is presently shown that the ratio of ethane emission to methane emission in Neptune's 7-14 micron spectrum increased by a factor of 1.47 +/- 0.11 in the period between 1985 and 1991, and that the 12.2-micron ethan feature (rather than that of methane at 7.7 microns) is implicated in the greater part of that change. It is speculated that this variation is due either to a nonuniform increase in stratospheric temperature, or (more likely) to an increase in the ethane concentration by over 15 percent.

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