Ground-based observations of H2O and NH3 on Jupiter during the Cassini flyby. Part 2: Data Analysis

Details Ground-based observations of H2O and NH3 on Jupiter during the Cassini flyby. Part 2: Data Analysis Ground-based observations of H2O and NH3 on Jupiter during the Cassini flyby. Part 2: Data Analysis

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.1123h&link_type=abstract

American Astronomical Society, DPS Meeting #33, #11.23; Bulletin of the American Astronomical Society, Vol. 33, p.1044

Astronomy and Astrophysics

Astronomy

Scientific paper

We will describe our analysis and present some initial results of observing Jupiter in December 2000 at 5.18 microns. We measured the equivalent widths of two CH4 absorption features and one NH3 absorption line as a function of position along a slit aligned east-west on Jupiter. Terrestrial CO2 and H2O lines were used for frequency calibration. We characterized the equivalent widths of the Jovian lines by simultaneously fitting multiple Lorentzian line shapes to the spectra using a Levenberg-Marquardt non-linear optimization algorithm. These equivalent widths can be used directly to study the spatial variation of the column abundance of NH3 above the 5-bar level on Jupiter. Radiative transfer models are required to convert CH4 equivalent widths into absolute mixing ratios of H2O on Jupiter. Initial results suggest significant variation of H2O and NH3 with longitude at the latitude of the Great Red Spot and in the North Equatorial Belt.

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