NASA Quarterly UVIS Q4 - 2007 (Aug. - Oct. 2007)

UVIS: Accomplishments Science Highlights Iapetus occultation analyzed to look for trace gases - none found - upper limits to be calculated Rhea occultation analyzed to look for trace gases - none found - upper limits to be calculated Enceladus mini-system scan preliminary results were reported at DPS Occultation of Enceladus’ plume on October 24 by zeta Orionis Analysis of density waves by occultation and theoretical models hint that Saturn’s B ring may be much more massive than thought

UVIS: Science Highlights Two Ultraviolet Views of Iapetus The far left image shows the bright-dark boundary region on Saturn’s moon Iapetus at far-ultraviolet wavelengths, viewed by Cassini's ultraviolet imaging spectrograph on Sept. 10, 2007. These wavelengths represent reflected solar light and indicate where the surface is brightest and highest in water ice abundance. (Red indicates the brightest regions, purple the darkest.) The bright Voyager mountains, part of the equatorial ridge, are seen as bright spots against a dark background. The dark material that covers one hemisphere of Iapetus is indicated in purple and is seen on the right side of this image. The middle image is a color composite: blue-green (longer ultraviolet wavelengths) indicates where the surface is bright and probably richest in water ice. Red (short ultraviolet wavelengths) indicates where the surface is low in water ice and relatively high in dirty material. The sky background is also bright at these wavelengths, making the limb, or edge, of Iapetus where the surface is dark indistinguishable from the sky background. The image on the right, taken by the imaging science subsystem, is for reference, with the regions observed by Cassini’s ultraviolet imaging spectrometer outlined in red.

UVIS: Accomplishments Publications Published this quarter 2 In Press (Went into press Aug-Oct, or still in press from earlier quarters) 8 Submitted (Submitted Aug-Oct, or submitted earlier but not in press/published yet) 7 Published 2007 to date: 9 Published Entire mission 55 Presentations at scientific meetings 7 papers at DPS in Orlando, FL, October 7-12 4 papers at PSG in Greece, June 2007 3 paper at Ices Oceans and Fire:Satellites in the Outer Solar System in Boulder, CO, August 2007 4 paper at Europlanet in Potsdam, Germany, August 19-24 2007 Public Outreach and Press Activities 2 public talks 2 press releases 2 press conferences

UVIS: Plans Science Plans (Nov 2007 - Jan 2008) Analysis of vertical structure in the rings from multiple stellar occultations. Publications (Nov 2007 - Jan 2008) In preparation (includes all papers submitted up to now, but not yet published - i.e. submitted in 2006, in review, etc.) 14 1 paper in press in Physical Review E 3 papers in press in Icarus 1 paper in press in Geophys. Res Lett 1 paper in press in Nature 1 paper in press in JGR 1 paper in press in Proc. 33rd Conf. on the Applications of Mathematics in Engineering and Economics Sozopol 1 paper submitted to Rev. Geophys. 1 papers submitted to Science 1 paper submitted to ApJ 1 paper submitted to JGR 1 paper submitted to Origin of Life and Planetary Evolution 1 paper submitted to Scholarpedia online 1 paper submitted to Astronomy and Astrophysics. Upcoming presentations at scientific meetings (Nov 2007 - Jan 2008) 3 papers at AGU in San Francisco, Dec. 10-14, 2007 (Esposito, Hansen, Sremcevic) Public Outreach and Press Activities (Nov 2007 - Jan 2008) 0 public talks 0 press releases 0 press conferences

Backup Material

UVIS: Publications - 2007 Tian, F., A.I.F. Stewart, O. B. Toon, K. Larsen, L. W. Esposito. 2007. Monte Carlo Simulations of the water vapor plume on Enceladus. Icarus 188, 154–161. (published January 2007) 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. 2007. Response of Jupiter's UV auroras to interplanetary conditions as observed by theHubble Space Telescope during the Cassini fly-by campaign. J. Geophys. Res. 112, A02203, doi:10.1029/2006JA012005. (Published Feb 2007) Nichols, J. D., E. J. Bunce, J. T. Clarke, S. W. H. Cowley, J.-C. Gerard, D. Grodent, and W. R. Pryor. 2007. Response Pryorof Jupiter's UV auroras to interplanetary conditions as observed by the Hubble Space Telescope during the Cassini fly-by campaign. J. Geophys. Res. 112, A02203, doi:10.1029/2006JA012005. (Published Feb. 2007) Parkinson C.D., M-C. Liang, H. Hartman, C.J. Hansen, G. Tinetti, V. Meadows, J. L. Kirschvink, and Y.L. Yung. 2007. Enceladus: Cassini Observations and Implications for the Search for Life. A&A. 463, 353–357. DOI: 10.1051/0004-6361:20065773. (pubished Feb. 2007) Liu, X., Shemansky, D. E., and Hallett, J.T. 2007. Extreme Non-LTE H2 in comets C/2000 WM1 (LINEAR) and C/2001 A2 (LINEAR). ApJSS. 169:458—471. (published April 2007) Liang, M-C, Yung, Y. and Shemansky, D. E. 2007. Photolytically generated aerosols in the mesosphere and thermosphere of Titan. ApJL, 661: L199-L202. (Published May 2007) Cruikshank, D.P. J. B. Dalton, C. M. Dalle Ore, J. Bauer, K. Stephan, G. Filacchione, A. R. Hendrix, C. J. Hansen, A. Coradini, P. Cerroni, F. Tosi, F. Capaccioni, R. Jaumann, B. J. Buratti, R. N. Clark, R. H. Brown, R. M. Nelson, T. B. McCord, K. H. Baines, P. D. Nicholson, C. Sotin, A. W. Meyer, G. Bellucci, M. Combes, J.-P. Bibring, Y. Langevin, B. Sicardy, D. L. Matson, V. Formisano, P. Drossart and V. Mennella. 2007. The Surface Composition of Hyperion. Nature. Volume 448, 54-56. (published July 2007) Liang, , M-C., A. N. Heays, B. R. Lewis, S. T. Gibson, and Y. L. Yung. 2007. Source of Nitrogen Isotope Anomaly in HCN in the Atmosphere of Titan. ApJ. 664: L115-L118 (Published August 1, 2007) Colwell, J.E., L. W.Esposito, M. Sremcevic, G. R. Stewart, and W. E. McClintock. 2007. Self-Gravity Wakes and Radial Structure of Saturn's B Ring. Icarus. (Published Sept. 2007)

UVIS: Publications (In Press) Hendrix, A.R., C.J. Hansen. Ultraviolet Observations of Phoebe from Cassini UVIS. Icarus. (In Press as of 7/07) Hendrix, A.R., Hansen, C.J.. The Albedo Dichotomy of Iapetus Measured at UV wavelengths. Icarus. (In press as of 10/07) Howard, J.E.. 2007. "Recent Progress in Planetary Dust Dynamics", Proc. 33rd Conf. on the Applications of Mathematics in Engineering and Economics Sozopol, Bulgaria, June 8-12, 2007 (In Press as of Aug. 2007 ). Sremcevic, M, J. Schmidt, H. Salo, M. Seiss, F. Spahn& N. Albers. 2007. A belt of moonlets in Saturn's A ring. Nature. (In Press as of Aug 30, 2007) Brilliantov, N., N. Albers, F. Spahn, and T. Poeschel. 2007 "Collision dynamics of granular particles with adhesion" Physical Review E (In Press as of Sept 2007) Esposito, L.W., B. K. Meinke, J.E. Colwell, P.D. Nicholson, M.M. Hedman. 2007. Moonlets and Clumps in Saturn’s F Ring. Icarus. (In press as of Oct 6, 2007) Ajello, J. M., M. H. Stevens, A. I. F. Stewart, K. Larsen, L. W. Esposito, J.E. Colwell, W. E. McClintock, G. Holsclaw, J. Gustin, W. R. Pryor. 2007. Titan Airglow Spectra from Cassini UVIS: I. EUV Analysis. Geophys. Res. Lett. (In Press as of October 2007) Liu, X., D.E. Shemansky, C.P. Malone, P.V. Johnson, J.M. Ajello, I. Kanik, A.N. Heays, B.R. Lewis, S.T. Gibson and G. Stark. 2007. Experimental and coupled-channels investigation of the radiative properties of the N2 1Σ–X 1Σ band system. ApJ. (In Press as of October, 9, 2007)

UVIS: Publications (Submitted) Aguilar, A., J.M, Ajello, R.S. Mangina, G.K. James. 2007. The Electron Excited Middle UV to Near IR Spectrum of H2: Cross sections and Transition Probabilities. ApJ. (Submitted March 2007, acceptance likely Nov 1) Ajello J.M., A. Aguilar, R. S. Mangina, G. K. James, P.Geissler, L. Trafton. 2007. The Middle UV to Near IR Spectrum of Electron Excited SO2. JGR-Planets. (Submitted March, 2007, acceptance likely Nov 1). Andre, N., M. Blanc, S. Maurice, P. Schippers, E. Pallier, T. I. Gombosi, K. C. Hansen, D. T. Young, F. J. Crary, S. Bolton, E. C. Sittler, H. T. Smith, R. E. Johnson, R. A Baragiola, A. J. Coates, A. M. Rymer, M. K. Dougherty, N. Achilleos, C. S. Arridge, S. M. Krimigis, D. G. Mitchell, N. Krupp, D. C. Hamilton, I. Dandouras, D. A. Gurnett, W. S. Kurth, P. Louarn, R. Srama, S. Kempf, J. H. Waite, L. W. Esposito, J. T. Clarke. Magnetospheric Regions and Associated Plasma Processes: Synopsis of Cassini Observations During Orbit Insertion. Rev. Geophys.( Submitted July 2007.) Parkinson, C. D., A. C. Barr, M. C. Liang and Y. L. Yung. 2007. “Habitability of Enceladus: Planetary Conditions for Life”. Origin of Life and Planetary Evolution. (Submitted August 2007) Jones, G., C.J. Hansen, and A.R. Hendrix, A.R. 2007. Rhea-Title pending. Science. (Submitted October, 2007) Pryor, W., P. Gangopadhyay, B. Sandel, T. Forrester, E. Quemerais, E. Moebius, L. Esposito, I. Stewart, B. McClintock, A. Jouchoux, J. Colwell, V. Izmodenov, Y. Malama, K. Tobiska, D. Shemansky, J. Ajello, C.Hansen, M. Bzowski and P. Frisch. 2007. Radiation transport of heliospheric Lyman-alpha from combined Cassini and Voyager data sets. Astronomy and Astrophysics. (to be submitted in October 2007) Howard, J.E. 2007. "Stability of Hamiltonian Flows" Scholarpedia. www.scholarpedia.org/article/Stability_of_Hamiltonian_Flows. (To be submitted in October.)

UVIS: Science Presentations - 2007 DPS, October 7-12, Orlando, FL Colwell: Poster presentation on Analysis of Density Waves and Bending Waves in Saturn's Rings from Cassini Star Occultations Hansen, Hendrix, Esposito and Meinke: New Cassini UVIS Observations of Enceladus’ Plume Hendrix and Hansen: Iapetus as measured by Cassini Esposito and Elliot: Stochastic Model for Regolith Growth and Pollution on Saturn’s Moons and Ring Particles Shemansky, Yung, Liang: Titan Atmospheric structure from 2000 Km to 300 Km: Models compared to Cassini UVIS observations. Liang, Heays, Lewis, Gibson, Yung: Source of Nitrogen Isotope Anomaly in HCN in the Atmsophere of Titan. Albers and Esposito: Modeling the Size Distribution of Saturn's Rings. PSG, June 2007, Greece Hansen: TOST Report Esposito, Meinke and Colwell: Clumps and Moonlets in Saturn’s F Ring Esposito: Cassini UVIS Results on the Enceladus Plume and Spacecraft Safety Ices, Oceans and Fire:Satellites in the Outer Solar System, August 2007, Boulder, CO, Hansen and Hendrix: Far Ultraviolet Observations of Icy Satellite Atmospheres and Plumes Hendrix and Hansen: Ultraviolet Measurements of the Surfaces of the Icy Saturnian Satellites Europlanet, August 19-24 2007, Potsdam, Germany Esposito, Colwell and Stewart: Cassini UVIS Observations and the History of Saturn’s Ring Esposito: The Potential Hazard to Cassini from Small Dust in Enceladus Plumes Albers, N.Saturn's F ring: Observations and Modeling

UVIS: Outreach - 2007 2: Press releases Stewart and Colwell : October 8, 2007 —"New Evidence for a Primordial Origin of Saturn's Rings" Hendrix: October 8, 2007—"Two Ultraviolet Views of Iapetus" 2: Press conferences & interviews Stewart: "New Evidence for a Primordial Origin of Saturn's Rings” October 8, 2007, at the DPS in Orlando, FL Hendrix with Denk, Spencer, Clark and Johnson: “Science results from the recent Cassini flyby of Iapetus—Two Ultraviolet Views of Iapetus" October 8, 2007, at the DPS in Orlando, FL 2: EPO: Talks to school children, teachers and public Colwell: "Running Rings Around Saturn" to 20 members of the University of Central Florida Astronomical Society on Wednesday September 19 Hansen: "The Discovery of Enceladus’ Water Vapor Plume", JPL, 20 August 2007