1 UVIS Input to Cassini Quarterly Report L.W. Esposito October 23, 2006 (For Aug-Oct 2006)

2 UVIS Accomplishments Science Highlights –Self-gravity wakes observed throughout Saturn's B ring. Multiple occultations allow measurement of wake properties, showing B ring self-gravity wakes are only a few meters thick and ~ 100 meters wide with narrow (10-30 m) gaps between them. The model from previous occultation data predicts well our new observation.

3 UVIS Accomplishments (Continued) Scientific Publications –Published Aug - Oct 2006: 0 –2006 to date: 3 (From Q1’s start of Feb through Q4’s end of Jan. 2007) –Entire mission: 43 (including 20 additions that were recently found on the JPL Cassini bibliography site, but were not included in our prior reports) –Submitted Aug - Oct 2006: 2 –Submitted in (From Q1’s start of Feb through Q4’s end of Jan. 2007)

4 UVIS Accomplishments (Continued) Science Presentations - Aug-Oct 2006 –1 Science Seminars –16 Presentations at Scientific Meetings

5 UVIS Accomplishments (Continued) Public Outreach –Press releases 0 Aug-Oct YTD (From Q1’s start of Feb through Q4’s end of Jan. 2007) –Press conferences & interviews 0 Aug-Oct YTD (From Q1’s start of Feb through Q4’s end of Jan. 2007) –EPO: Talks to school children, teachers and public 0 Aug-Oct YTD (From Q1’s start of Feb through Q4’s end of Jan. 2007)

6 UVIS Plans For Nov Jan 2007 Upcoming Science Activities (for next quarter) –Enceladus flyby in November and Dione flyby in November. FUV maps will be acquired to analyze and compare icy satellite surface composition, grain size of ices, photometry, and to look for the existence of tenuous gases. We will attempt to see changes in the plume discovered at Enceladus last year. –Multiple ring star occultations. Publications in the works this quarter –“ Moonlets and Clumps in Saturn’s F Ring” Esposito, Meinke, Colwell. Submitted to Icarus in Sept. EPO in the works (for next quarter) –Ring movie Upcoming Science Presentations and Seminars (for next quarter) –AGU, San Francisco, December (Pryor, Esposito, Colwell)

7 Backup Material UVIS October 23, 2006

8 UVIS Publications: Published 2006 (From Q1’s start of Feb through Q4’s end of Jan ) Hansen, C., J. Colwell, L.W. Esposito, A.R. Hendrix, W. Pryor, D. E. Shemansky, A.I.F. Stewart, R.A. West. (2006) Enceladus’ Water Vapor Plume. Science no (Published March 10, 2006.) Liu, X., and D. E. Shemansky. (2006) Analysis of electron impact ionization properties of methane, J. Geophys. Res., 111, A04303, doi: /2005JA011454, (Published April 2006.) Colwell, J.E., L. W. Esposito, and M. Sremcevic. (2006) Self-gravity wakes in Saturn’s A ring measured by stellar occultations from Cassini. GRL. 33, L07201, doi: /2005GL (Published in April 2006)

9 UVIS Publications: Submitted 2006 (From Q1’s start of Feb through Q4’s end of Jan. 2007) Parkinson, C. D., M. C. Liang, H. Hartman, C. J. Hansen, G. Tinetti, V. Meadows and Y. L. Yung. (2006) Enceladus: Cassini Observations and Implications for the Search for Life" Submitted to Astrophys. J. Lett. (Submitted February 2006, in press.) Hallett, J.T., D. E. Shemansky, X. Liu. (2006) Rotational-level hydrogen chemistry model of the Cassini UVIS observed Saturn dayglow. J. Geophys. Res., (Submitted March 2006, in review.) Tian, F., A.I.F. Stewart, Owen B. Toon, Kristopher Larsen, Larry W. Esposito. (2006) Monte Carlo Simulations of the water vapor plume on Enceladus. Icarus. (Submitted April 2006.) Liu, X., and D. E. Shemansky. (2006) A simple model for N2 line oscillator strengths of the bands, Atrophys. J., 645, July 10, doi: /’504465’, (Accepted for publication March 2006.) Nichols, J. D., E. J. Bunce, J. T. Clarke, S. W. H. Cowley, F. J. Crary, M. K. Dougherty, J.-C. Gerard, D. Grodent,W. R. Pryor, and A. M. Rymer, Response of Jupiter's UV auroras to interplanetary conditions as observed by theHubble Space Telescope during the Cassini fly-by campaign. (Submitted to Annales Geophysicae June 2006, accepted October 2006) Colwell, J.E., L. W.Esposito, M. Sremcevic, W. E. McClintock, and G. R. Stewart. Self-Gravity Wakes and Radial Structure of Saturn's B Ring. Icarus (submitted July 2006) Esposito, L.W.E., B. K. Meinke, J.E. Colwell, P.D. Nicholson, M.M. Hedman. Moonlets and Clumps in Saturn’s F Ring. Icarus. (submitted September 2006) Hendrix, A.R., C.J. Hansen. Ultraviolet Observations of Phoebe from Cassini UVIS. Icarus. (Submitted September 2006)

10 UVIS Science Presentations: Aug-Oct 2006 Science Seminars –Colorado State University Physics Dept., Sept 11, “Running Rings around Saturn - A Cassini Overview”, Colwell. Presentations at Scientific Meetings –DPS, Pasadena, Oct (Colwell, Esposito, Albers, Sremcevic, Pryor, Shemansky, Hendrix, Meinke, Howard, Lewis and G. Stewart) –Rings Working Group (RWG) - Montana, Aug (Colwell, Esposito, Sremcevic) –International Space Science Institute interplanetary hydrogen workshop, Bern, Switzerland, September, “ Cassini and Voyager Lyman-alpha data”. (Pryor) –Enceladus Focus Group meeting, Pasadena, Oct. 8 (Hendrix)

11 UVIS Outreach: Aug-Oct 2006 Press Releases –None Press Conferences & Interviews –None Talks to School teachers Children and Public –None