UVIS Input to Cassini Quarterly Report L.W. Esposito October 24, 2005

UVIS Accomplishments Science Highlights Discovered a water plume on Enceladus, measured water abundance, estimated total source, which is enough to resupply Saturn's E-ring and oxygen torus. Measured the physical characteristics of self-gravity wakes in Saturn's A-ring, through comparison of multiple star occultations by Saturn's rings. These clumps are flat and dense, separated by large distances, and so small as to be invisible to Cassini's cameras.

UVIS star occultation shows Enceladus plume

shows ephemeral self-gravity wakes

UVIS observes Saturn’s aurora

UVIS Accomplishments (Continued) Publications August — October 2005: 0 scientific publications 2005 to date: 8 Entire mission: 14 In Press: 4

UVIS Accomplishments (Continued) Science Talks - August — October 2005 3 Science Seminars 10 Presentations at Scientific Meetings

UVIS Accomplishments (Continued) Public Outreach Press releases 1 August—October 2005 7 2005 YTD Press conferences 1 August—October 2005 Enceladus Press conference in London: Candice Hansen 1 2005 YTD Talks to school children, teachers and public 2 August—October 2005 5 2005 YTD

UVIS Plans (Nov. 2005—Jan. 2006) Upcoming Science Activities Solar occultation by Titan’s atmosphere Longitudinal coverage of icy satellites Publications and EPO in work 2 papers submitted to journals Community talk with Larry Esposito and Carolyn Porco at CU in December - “Cassini Views the Saturn System” Cassini Mission to be Explored at Fiske Planetarium - Josh Colwell in October Upcoming Science Events AGU - December UVIS Team Meeting - January

Backup Material UVIS October 24, 2005

UVIS Publications: Published 2005 Esposito, L.W., J. E. Colwell, K. Larsen, W. E. McClintock, A. I. F. Stewart, J. Tew Hallett, D. E. Shemansky, J. M. Ajello, C. J. Hansen, A. R. Hendrix, R. A. West, H. U. Keller, A. Korth, W. R. Pryor, R. Reulke, Y. L. Yung. (2005). Ultra-Violet Imaging Spectroscopy shows an active Saturn system. Science. 307, 1251-1255. LASP reprint 1000. Hallett, J. T., D. E. Shemansky, X. Liu. (2005a). A Rotational-Level Hydrogen Physical Chemistry Model for General Astrophysical Application. ApJ. 624, 448-461. Hallett, J. T., D. E. Shemansky, X. Liu. (2005b). Fine-Structure Physical Chemistry Modeling of Uranus H2 X Quadrupole Emission. GRL. 32, L02204. Shemansky, D.E., A.I.F. Stewart, R.A. West, L.W. Esposito, J.T. Hallet, X. Liu. (2005) The Cassini UVIS stellar probe of the Titan atmosphere. Science. 308, 978-982. Steffl, A. J., P.A. Delamere, F. Bagenal. Cassini UVIS Observations of the Io Plasma Torus. III. Temporal and Azimuthal Variability. Submitted to Icarus March, 2005. Hallett, J.T, X. Liu, D.E. Shemansky, A Rotational-Level Hydrogen Physical Chemistry Model for General Astrophysical Application (published in ApJ 2005) Hallett, J.T., X. Liu, D.E. Shemansky. Fine-Structure Physical Chemistry Modeling of Uranus H2 X Quadrupole Emissions (published in GRL 2005) Hansen, C.J., A.R. Hendrix, D.E. Shemansky. Cassini UVIS Observations of Europa's Oxygen Atmosphere and Torus, (submitted to Icarus April 17, 2004, revision submitted 2/4/05)

UVIS Publications: Submitted 2005 Ajello, J.M., J. T. Clarke, L.W. Esposito, J. –C Gérard, D. Grodent, J. Gustin, W.E. McClintock, W.R. Pryor, A.I.F. Stewart.The Cassini Campaign Observations of the Jupiter Aurora by the Ultraviolet Imaging Spectrograph and the Space Telescope Imaging Spectrograph. Icarus, accepted July 2005. Liu, X., D. E. Shemansky. Analysis of electron impact ionization properties of methane, JGR, In review Hansen, C., J. Colwell, L.W. Esposito, A.R. Hendrix, W. Pryor, D. E. Shemansky, A.I.F. Stewart, R.A. West. Cassini UltraViolet Imagaing Spectrograph (UVIS) Investigation of Enceladus’ Water Vapor Plume. Science, Submitted in October Colwell, J.E., L.W. Esposito, M. Sremcevic, Gravitational Wakes in Saturn’s A Ring Measured by Stellar Occultations from Cassini. Nature, Submitted in October.

UVIS Science Presentations: 2005 Seminars Linear and Non-linear processes in Saturn's Rings, Potsdam University - July UCLA: History of Saturn's Rings, UCLA - October Linear and Non-linear processes in Saturn's Rings, University of Arizona - October Science Talks 6: DPS 1: MOP 2: PSG London 1: Crete meeting on Titan

UVIS Outreach: 2005 Alumni Talk at CU in Jan. - Larry Esposito Live Broadcast of Huygens in Jan. at CU - Various team members Wireless Grid project with Boston Museum of Science in July - Larry Esposito CHARM presentation in August - Larry Esposito Executive Development Program in October at CU - Joshua Colwell