first attempt seemed to not attach scientific justification, resubmitting with justification attached Assigned ID: 775 ----- Attempting Submission 1 (Fri Feb 26 23:15:26 GMT 2010) ----- HST Phase I Proposal 775 (impacts-AR_v2.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 26 23:20:28 GMT 2010) ----- Known APT bug, WFC3 instrument not available for datasets. I edited the .apt text file to set instrument to WFC3. Seven months after Hubble’s first servicing mission, the impact of Comet Shoemaker-Levy 9 (SL9) captured worldwide attention—and the newly-installed WFPC2 captured 472 images of Jupiter in Program 5642. We will complete a census of each impact, including evolution, size, morphology, and color, now that the geometric and photometric calibration of WFPC2 has reached its best and final state. The data from Program 5642 prove their great value by still continuing to generate science publications, and we will upload deprojected (latitude-longitude mapped) data as High Level Science Products to further enhance the usability of this unique data set. The WFPC2 data are needed to understand recent observations of the 2009 impact on Jupiter, in which only 36 WFC3 and ACS images were obtained in Program 12003. In the isolated 2009 impact, the debris formed clumps that lasted at least until Jupiter was imaged again on 22 September (Program 11559), two months after the impact. Clumps were observed in a subset of SL9 impact sites, but a complete survey of all the available WFPC2 impact site imaging data will enable us to measure clump formation, favored dynamical environments, frequency of occurrence, interactions with other Jovian atmospheric features, and rates of change in size and albedo. Based on the 2009 WFC3 and ACS data, we suggest that these clumps are lower stratospheric eddies that maintain aerosol concentrations against dissipation. We will search the proposed complete catalog of 1994 WFPC2 data to isolate the determining factors for the formation and evolution of these clumps, with the goal of finding out whether they are commonplace Jovian dynamical features simply traced by impact-generated aerosols, or unique features generated by the impacts themselves (either through impact-related thermochemical processes, or through differences in particle microphysics). If the clumps mark commonplace but normally invisible eddies, they may play interesting roles in the chemistry and dynamics in Jupiter’s lower stratosphere.

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