Measurements of stratospheric ethane in the Jovian South Polar Region from infrared heterodyne spectroscopy of the nu9 band near 12 microns

Details Measurements of stratospheric ethane in the Jovian South Polar Region from infrared heterodyne spectroscopy of the nu9 band near 12 microns Measurements of stratospheric ethane in the Jovian South Polar Region from infrared heterodyne spectroscopy of the nu9 band near 12 microns

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..564k&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 564-569. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

26

Abundance, Ethane, Infrared Spectroscopy, Jupiter Atmosphere, Stratosphere, Brightness Temperature, Carbon Dioxide Lasers, Emission Spectra, Line Spectra, Optical Heterodyning, Polar Regions, Radiative Transfer, Spectral Line Width, Spectral Resolution, Jupiter, Stratosphere, Ethane, Polar Regions, Infrared, Wavelengths, Spectroscopy, Emissions, Comparisons, Rotation, Brightness Temperature, Analysis, Models, Radiative Transfer, Temperature, Profiles, Mixing, Ratios, Abundance, Spectra, Observations, Proced

Scientific paper

Ethane emission-line profiles from the South Polar Region of Jupiter were measured at sub- Doppler resolving powers (v/Δv ≍ 106) using the Goddard Space Flight Center infrared heterodyne spectrometer. Lines in the RQ3-branch of the V9 fundamental of ethane near the P42 14C16O2 laser transition at 829.9273 cm-1 were observed. Comparison with diode laser laboratory spectroscopy showed that the planetary line widths were limited by velocity broadening ( ˜200 MHz) due to Jovian rotation within our field of view (FWHM = 2"). Peak brightness temperatures of the lines were measured to be ˜160 K implying monochromatic (unbroadened) line brightnesses approaching 170 K. Analytical fits to our data were made by direct modeling of the radiative transfer equation using a Voyager 2 polar temperature profile and various vertical profiles for C2 H6, H2, and NH3. The best fit required a constant C2H6:H2 mixing ratio above the 100 mbar level of 1.2 × 10-6. These results are compared with previous work and Voyager infrared interferometer spectrometer results.

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