UVIS Data Analysis and Modeling: Saturn FUV images * 07/16/96 UVIS Data Analysis and Modeling: Saturn FUV images R. West and D. Tice With help from many team members *

Nine EUVFUV sets Row -> Integration number -> * 07/16/96 Nine EUVFUV sets Row -> Integration number -> Residual vertical striping is apparent *

Data Reduction Cube Generator (includes flat field) * 07/16/96 Data Reduction Cube Generator (includes flat field) Image geometry is a product Divide by a solar spectrum from Amanda Hendrix and processed by D. Shemansky’s simulator software, then factor in `99 calibration and red patch to get I/F Subtract a background from off-planet pixels Extract data in a latitude band and fit to Minneart function to improve signal/noise *

Selection of Pixels in a Latitude Band -30+-10 Deg.

* 07/16/96 Minneart Fit *

Model 1600-1900 Å Multiple Scattering radiative transfer, including polarization Rayleigh scattering by molecular H2 and He Absorption and scattering by aerosols Absorption by (mainly) C2H2, PH3, other hydrocarbons Gas profiles from Moses et al. (2000) and Prange et al. 2005

Relevant Absorbers (from Prangé et al., 2005)

Profiles from Moses et al., 2000

First Results – Acetylene Center Limb Model 00A

Improved Model Center Limb Model 05 (p’ = 0.5*P; A’ = 0.5*A)

Immediate Needs Settle flat-field and calibration issues B. McClintock, Lead Improved instrument simulator D. Shemansky Standard Fortran, update calibration Image deconvolution(?) Inclusion of Raman scattering in the model(?)

References Moses, J. et al., ‘Photochemistry of Saturn’s Atmosphere I. Hydrocarbon Chemistry and Comparisons with ISO Observations’, Icarus 143, 244–298 (2000) Prangé, R. et al., ‘Latitudinal variation of Saturn photochemistry deduced from spatially-resolved ultraviolet spectra’, Icarus 180, 379-393 (2005).