Jupiter Systems Data Analysis Program Galileo Multi-Spectral Analysis of the Galilean Satellites

Details Jupiter Systems Data Analysis Program Galileo Multi-Spectral Analysis of the Galilean Satellites Jupiter Systems Data Analysis Program Galileo Multi-Spectral Analysis of the Galilean Satellites

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0251139h&link_type=abstract

Technical Report, Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States

Physics

Sulfur Dioxides, Near Infrared Radiation, Infrared Imagery, Ultraviolet Absorption, Io, Ultraviolet Spectrometers, Galileo Spacecraft, Systems Analysis

Scientific paper

Progress was made on this project at the University of Colorado, particularly concerning analysis of data of the galilean moons Io and Europa. The goal of the Io portion of this study is to incorporate Near Infrared Mapping Spectrometer (NIMS) measured sulfur dioxide (SO2) frost amounts into models used with Ultraviolet spectrometer (UVS) spectra, in order to better constrain SO2 gas amounts determined by the UVS. The overall goal of this portion of the study is to better understand the thickness and distribution of Io's SO2 atmosphere. The goal of the analysis of the Europa data is to better understand the source of the UV absorption feature centered near 280 rim which has been noted in disk-integrated spectra primarily on the trailing hemisphere. The NIMS data indicate asymmetric water ice bands on Europa, particularly over the trailing hemisphere, and especially concentrated in the visibly dark regions associated with chaotic terrain and lines. The UPS data, the first-ever disk-resolved UV spectra of Europa, shown that the UV absorber is likely concentrated in regions where the NIMS data show asymmetric water ice bands. The material that produces both spectral features is likely the same, and we use data from both wavelength regions to better understand this material, and whether it is endogenically or exogenically produced. This work is still in progress at JPL.

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