Interpretation of the 6815 A band of methane observed in the major planets

Details Interpretation of the 6815 A band of methane observed in the major planets Interpretation of the 6815 A band of methane observed in the major planets

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........4b&link_type=abstract

Ph.D. Thesis Washington Univ., Saint Louis, MO.

Computer Science

2

Jupiter (Planet), Methane, Neptune (Planet), Planetary Environments, Planetary Structure, Planetology, Saturn (Planet), Uranus (Planet), Aerosols, Deep Space, Neptune Atmosphere, Stratosphere Radiation, Uranus Atmosphere

Scientific paper

High resolution spectra of the 6815 band of methane were obtained for Jupiter, Saturn, Uranus, and Neptune. A curve of growth analysis yields initial estimates for the effective pressure level, methane abundance, and methane mixing ratio for each of the outer planets. It is indicated that features observed within Jupiter and Saturn are formed at relatively high altitudes, while Uranus and Neptune indicate effective pressure levels of three to four Earth atmospheres. A factor of three enhancement of methane throughout the outer solar system is indicated. More complex models are calculated which account for vertical inhomogeneities, and which also are constrained to complementary observations. It is shown that the aerosol content within Saturn's northern temperate region is substantially different from that at the equator, indicating a haze only half as optically thick. Synthetic line profiles of the 6818.9 observed in Uranus reveal a substantial stratospheric haze exists with an optical thickness eight times greater than previously reported. The mixing ratio of methane in the deep atmosphere is some 4%, indicates that methane comprises more than 30% of the Uranian atmosphere by weight.

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