0 Assigned ID: 634 ----- Attempting Submission 1 (Fri Apr 05 18:52:10 GMT 2019) ----- The four Galilean satellites of Jupiter have been the subjects of acute interest since the first spacecraft flybys nearly 50 years ago. In this time we have learned of internal oceans, massive volcanos, CO2 and O2 atmospheres, and intense radiation bombarding the surfaces. Much of our understanding of the composition of these satellites has come from infrared spectroscopy. Visible and UV spectroscopy have been comparatively underutilized, yet these wavelength ranges have critical absorption features that can be used to map surface, interior, and exogenous processes in unique ways. We propose to analyze the large amount of unpublished archival UV and visible spatially resolved STIS spectroscopy of the Galilean satellites to map the prduction of O2 atmospheres, trace sulfur pathways through the satellite system, and search for salts coming from internal oceans and magmas. Combined with our GO proposal to complete the missing observations, our final product will be complete 200-1000nm spectral maps of all four satellites. We will create accessible data products that will be easily available to the community, thereby presenting a valuable resource for interpreting past and upcoming spacecraft and telescope observations of these satellites for many years to come. Our team has extensive experience in Galilean satellite spectroscopy and in STIS spatially resolved slit scan spectroscopy. We recently published the first visible wavelength resolved spectroscopic observations of any such satellite (Trumbo et al. 2019) and have demonstrated the ability to measure color centers, UV absorption, and sulfur species through our preliminary archival analyses. Solar System 0 Regular false false true false false SUPPORTED