Galilean satellite eclipse studies: III. Jovian methane abundance |
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| Authors: | Dale W Smith Thomas F Greene |
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| Institution: | 1. Department of Astronomy, University of Washington, Seattle, Washington 98105, USA;2. Boeing Aerospace Company, Seattle, Washington 98124, USA |
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| Abstract: | The methane abundance in the lower Jovian stratosphere is measured using Galilean satellite eclipse light curves. Spectrally selective observations in and between absorption bands are compared. An average mixing ratio at the locations measured is CH4]/H2] ～ 1.3 × 10?3, larger than the value 0.9 × 10?3 expected for a solar abundance of carbon. Some zenographic variation of the mixing ratio may occur. Observationally compatible values are 1.3–2.0 × 10?3 in the STZ, 1.3– 2.6 × 10?3 on the GRS/STrZ edge, and 0.7–1.3 × 10?3 in the GRS. |
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