UVIS Input to Cassini Quarterly Report L.W. Esposito January 18, 2006 (For Nov Jan 2006)

UVIS Accomplishments Science Highlights –Detection of small (15-micron) particles in Saturn’s F Ring –Dione, Tethys and Rhea imaged in UV light during Cassini flybys –UVIS observations of He 584 A resonance line show the polar region of Jupiter to be more turbulent than the equatorial region

Dione: October, 2005 Dione imaged in UV light during the Cassini flyby. North is up and the terminator is close to the edge of the disk in the north. Brightness variations across the surface are apparent. Saturn’s rings, viewed edge-on, are visible below the moon.

Tethys: September 24, 2005 Red=1216Å (interplanetary hydrogen); blue/green=reflected solar light at longer FUV wavelengths. Saturn’s icy moons are darker than the surrounding environment at short wavelengths (e.g., 1216 Å) but are very bright and reflective at the longer wavelengths, due to their water ice-rich surfaces.

Rhea: November 26, 2005 Rhea imaged in UV light during the Cassini flyby. Brightness variations across the surface are apparent. In particular, abright crater appears at the edge of the disk on the right side.Saturn’s rings, viewed edge-on, are visible below the moon.

UVIS Accomplishments (Continued) Scientific Publications –Published November January 2006: 3 (Ajello, Pryor, Yung [Laing]) –2005 to date: 9 –Entire mission: 15 –Submitted November January 2006: 3 (Colwell, Yung [2]) –Submitted and in process in 20056

UVIS Accomplishments (Continued) Science Presentations - November 2005 — January 2006 –2 Science Seminars –9 Presentations at Scientific Meetings

UVIS Accomplishments (Continued) Public Outreach –Press releases 1 November January YTD –Press conferences 0 November January YTD –Talks to school children, teachers and public 2 November January YTD

UVIS Plans (February - April 2006) Upcoming Science Activities (for next quarter) –T10 Solar occultation by Titan Publications in the works this quarter –1 paper submitted to journals EPO in the works (for next quarter) –UVIS observations of Enceladus' Water Vapor Plume seminar, Cal Tech, February 21 (Yuk Yung's group) –Cassini UVIS Observations of Saturn’s Icy Moons, UC Santa Cruz, Center for Origin, Dynamics and Evolution of Planets, Feb 24 (Hendrix) –Cassini UVIS Observations of Saturn’s Icy Moons, Cal Tech, March 7 (Yuk Yung’s group) Upcoming Science Events (for next quarter) –Icy Satellite Workshop, JPL, January (Hendrix and Hansen) –Lunar and Planetary Science Conference (LPSC), Houston, March (Hendrix and Hansen) –EGU - Vienna, April 2-7 (Esposito and Sremcevic)

Backup Material UVIS January 18, 2006

UVIS Publications: Published 2005 Ajello, J., W. Pryor, L. Esposito, I. Stewart, W. McClintock, J. Gustin, D. Grodent, J. –C Gérard and J. Clarke, “The Cassini Campaign Observations of the Jupiter Aurora by the Ultraviolet Imaging Spectrograph and the Space Telescope Imaging Spectrograph”, Icarus, 178, 327 (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, LASP reprint Hallett, J. T., D. E. Shemansky, X. Liu. (2005a). A Rotational-Level Hydrogen Physical Chemistry Model for General Astrophysical Application. ApJ. 624, Hallett, J. T., D. E. Shemansky, X. Liu. (2005b). Fine-Structure Physical Chemistry Modeling of Uranus H 2 X Quadrupole Emission. GRL. 32, L Hansen, C.J., A.R. Hendrix, D.E. Shemansky. Cassini UVIS Observations of Europa's Oxygen Atmosphere and Torus, Icarus 176, 305–315 (2005) Liang, M. C., R. L. Shia, A. Y. T. Lee, M. Allen, A. J. Friedson, and Y. L. Yung (2005), Meridional Transport in the Stratosphere of Jupiter. Astrophys. J. Lett., 635:L177-L180. Pryor, W. R., A. I. F. Stewart, L. W. Esposito, D. E. Shemansky, J. M. Ajello, R. A. West, A. J. Jouchoux, C. J. Hansen, W. E. McClintock, J. E. Colwell, B. T. Tsurutani, N. Krupp, F. J. Crary, D. T. Young, W. S. Kurth, D. A. Gurnett, M. Dougherty, J. T. Clarke, J. H. Waite, Jr., and D. Grodent. Cassini UVIS observations of Jupiter's auroral variability, Icarus 178, , (2005). 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, Steffl, A. J., P.A. Delamere, F. Bagenal.(2006) Cassini UVIS Observations of the Io Plasma Torus. III. Temporal and Azimuthal Variability. Icarus. 180, Issue 1,

UVIS Publications: Submitted 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. 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. Colwell, J.E., L.W. Esposito, M. Sremcevic, Self-Gravity Wakes in Saturn’s A Ring Measured by Stellar Occultations from Cassini. GRL, In review. Parkinson, C. D., J. C. McConnell, L. Ben Jaffe, A. Y. T. Lee, Y. L. Yung, and E. Griffioen (2006). Deuterium Chemistry and Airglow in the Jovian Thermosphere. Icarus: In Press. Parkinson, C. D., A. S. Wong, A. I. F. Stewart, and Y. L. Yung. (2006). Enhanced Transport in the Polar Mesosphere of Jupiter: Evidence from Cassini UVIS Helium 584 A Airglow. J. Geophys. Res.: In Press.

UVIS Science Presentations: November January 2006 Seminars –Mysteries beneath the Clouds of Saturn's Moon, Titan, CSU Los Angeles, Physics and Astronomy Department, January 19.” (Hansen) –Unravelling the Twists and Turns of Saturn’s Rings, University of Central Florida, Jan 9. (Colwell) Science Talks –6: AGU - December 5-9 (Esposito, Colwell, Hendrix, Hansen, Shemansky, Yung, Pryor) –3: PSG - January (planned: Colwell, Esposito, Shemansky)

UVIS Outreach: 2005 Press Releases –Article published in Science News, November 19 Press Conferences –Enceledus press conference in London (Hansen) Talks to School teachers Children and Public –Alumni Talk at CU in Jan. (Esposito) –Live Broadcast of Huygens in Jan. at CU (Various team members) –Wireless Grid project with Boston Museum of Science in July (Esposito) –CHARM presentation in August (Esposito) –Executive Development Program in October at CU (Colwell) –Community talk with Larry Esposito and Carolyn Porco in December - “Cassini Views the Saturn System” –Public Talk on Cassini results at the Central Arizona College Observatory, December 2 (Pryor)