NASA Quarterly UVIS Q3 - 2008 (May - July 2008)

UVIS: Science Highlights Matching Enceladus jets seen by UVIS and imaging: Plotted here as a function of UTC are: (1) the altitude above Enceladus' limb of the line-of-sight from Cassini to the star; (2) the attenuation of the HSP signal, scaled by a factor of 300; and (3) the projections of the 8 jets seen by the ISS instrument6 into the plane of the figure. The jets have each, for purposes of illustration, been assigned a length of 50 km. In the labels, the letters A, B, C, and D refer to the "tiger stripes" Alexandria, Baghdad, Cairo, and Damascus, respectively, and the original Roman numerals have been replaced by Arabic. The label C/A marks the closest approach of the line-of-sight to Enceladus. The times and positions at which the line-of-sight intersected the centerlines of the jets are marked by squares. Jet B7 was intersected 35 km from its source on Enceladus' surface; the corresponding distances for jets B6 and C8 were within 18 +- 1 km, and for the others, within 23 +- 2 km. Other things (such as jet strength) being equal, the width of the attenuation feature associated with each jet should be proportional, and the magnitude inversely proportional, to this distance.

UVIS: Accomplishments Publications Published this quarter 2 In Press (Went into press May-Jul and also includes still in press from earlier quarters) 2 Submitted (Submitted May-Jul and also includes submitted earlier and still in review) 6 Published 2008 to date: 9 Published Entire mission 69 Presentations at scientific meetings 2 papers at AGU Joint Assembly in Ft. Lauderdale, FL, May, 2008 (Colwell, Bradley) 4 papers at the COSPAR in Montreal, July 2008 (Colwell, Esposito, Hansen, Pryor) 1 paper at The Science of Solar System Ices workshop in Oxnard, CA, May 2008 (Hendrix) 5 papers at Saturn After Cassini/Huygens workshop in London, July 2008 (Albers, Bradley, Colwell, Esposito, Hendrix & Hansen) 1 paper at Ring Workshop in Paris, France, July 2008 2 papers at EGU in Vienna Austria, April 2008 Public Outreach and Press Activities 4: public talks 0: press releases 0: press conferences

UVIS: Plans Science Plans (Aug - Oct 2008) Scientific organizer for Cassini Rings Workshop to be held in Paris France, July 24-25, 2008 (Colwell) Analysis of sharp edges in Saturn’s rings using multiple stellar occultation profiles. (Colwell) Finish HDAC analysis and find best fitting model parameters to learn something about atomic hydrogen in Titans exosphere (Hedelt) Close Enceladus flyby in August Publications (Aug - Oct 2008) In preparation (includes all papers submitted up to now, but not yet published) 9 1 paper to Nature 1 paper to Icarus 1 paper to Astrophys. J. Suppl. 1 paper to GRL 1 paper submitted to JGR 1 paper submitted to Rev. Geophys 1 paper submitted to Origin of Life and Evolution of Biospheres 1 paper submitted to Astronomy and Astrophysics 1 paper submited to Scholarpedia Upcoming presentations at scientific meetings (Aug - Oct 2008) 4 papers at European Planetary Science Conference in Muenster Germany, September 2008. (Colwell, Hedelt, Esposito, Hansen) 3 papers at DPS in Ithaca New York, October 2008. (Colwell, Albers, Hansen) Public Outreach and Press Activities (Aug - Oct 2008) 0: public talks 0: press releases 0: press conferences

Backup Material

UVIS: Publications - 2008 Aguilar, A., J.M, Ajello, R.S. Mangina, G.K. James, H. Abgrall, E. Roueff. 2008. The Electron Excited Middle UV to Near IR Spectrum of H2: Cross sections and Transition Probabilities. ApJ. Supp. (Published July 1, 2008) Ajello J.M., A. Aguilar, R. S. Mangina, G. K. James, P.Geissler, L. Trafton. 2008. The Middle UV to Near IR Spectrum of Electron Excited SO2. JGR-Planets. (Published March 21, 2008) Ajello, J, J. Gustin, A.I.F. Stewart, K. Larsen, L.W. Esposito, W. Pryor, W. McClintock, M. H. Stevens, C.P. Malone and D. Dziczek. 2008. Titan airglow spectra from the Cassini Ultraviolet Imaging Spectrograph: FUV disk analysis. Geophys. Res. Lett. 35, L06102, doi:10.1029/2007GL032315. (Published 3/21/08) Esposito, L.W., B. K. Meinke, J.E. Colwell, P.D. Nicholson, M.M. Hedman. 2008. Moonlets and Clumps in Saturn’s F Ring. Icarus (Published March 2008) Hendrix, A.R., C.J. Hansen. 2008. Ultraviolet Observations of Phoebe from Cassini UVIS. Icarus. (Published Feb. 7, 2008) Hendrix, A.R., Hansen, C.J.. 2008 The Albedo Dichotomy of Iapetus Measured at UV wavelengths. Icarus. (Published Feb. 7, 2008) Jones, G. H., E. Roussos, N. Krupp, U. Beckmann, A. J. Coates, F. Crary, I. Dandouras, V. Kikarev, M. K. Dougerty, P. Garnier, C. J. Hansen, A. R. Hendrix, G. B. Hospodarsky, R. E. Johnson, S. Kempf, K. K. Khurana, S. M. Krimigis, H. Krueger, W. S. Kurth, A. Lagg, H. J. McAndrews, D. G. Mitchell, C. Paranicas, F. Postberg, C. T. Russell, J. Saur, M. Seiss, F. Spahn, R. Srama, D. F. Strobel, R. Tokar, J.-E. Wahlund, R. J. Wilson, J. Woch, D. Young. 2008. The Dust Halo of Saturn’s Largest Icy Moon, Rhea. Science. 319. no. 5868, pp. 1380 - 1384. doi: 10.1126/science.1151524. (published March 7, 2008) 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. 2008. Experimental and coupled-channels investigation of the radiative properties of the N2 1Σ–X 1Σ band system. JGR. (Published Feb. 2008) Parkinson, C.D., M-C.  Liang,  Y. L. Yung, J. L. Kirschivnk. 2008.. 2008. “Habitability of Enceladus: Planetary Conditions for Life”. Origin of Life and Planetary Evolution. (As of 7/1, should be published any day)

UVIS: Publications (In Press) 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. 2008. Magnetospheric Regions and Associated Plasma Processes: Synopsis of Cassini Observations During Orbit Insertion. Rev. Geophys. (Submitted July 2007. Accepted June 2008.) 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. 2008. Radiation transport of heliospheric Lyman-alpha from combined Cassini and Voyager data sets. Astronomy and Astrophysics. (Submitted October 16, 2007, went into press as of June 5, 2008)

UVIS: Publications (Submitted) Colwell, J. E., Cooney, J. H., Esposito, L. W., Sremcevic, M. 2008. Density Waves in Cassini UVIS Stellar Occultatios 1. The Cassini Division. Icarus. (Submitted June 6, 2008). Glass-Maujean, M., X. Liu and D. E. Shemansky, Analysis of Electron-Impact Excitation and Emission of the npσ 1S and npπ 1Πu Rydberg Series of H2, Astrophys J. Suppl. Ser., (Submitted on April 14, 2008) Hansen, C. J., Esposito, L.W., Stewart, A.I.F., Meinke, B., Wallis, B., Colwell, J., Hendrix, A.R., Larsen, K., Pryor, W., Tian, F.. 2008. Water Vapor Jets in Enceladus’ Plume. Nature. (Submitted June 3, 2008.) Howard, J.E. 2008. "Stability of Hamiltonian Flows" Scholarpedia. (Submitted in October.) No printed copy, just online. Larsen, K., J.Ajello, J. Gustin, and A.I.F. Stewart. 2008. “Variability in Titan's Nitrogen Emissions” GRL (to be submitted in July) Liu, X., A. Heays, D. E. Shemansky, B. R. Lewis and P. D. Feldman, Analysis of terrestrial-thermospheric N2 c 1S(0)~b’1S(1) - X 1S dayglow emission observed by the Far Ultraviolet Spectroscopic Explorer, J. Geophys. Res., (Submitted May 12, 2008)

UVIS: Science Presentations - 2008 AGU Joint Assembly in Ft. Lauderdale, FL, May, 2008 Colwell, J. E., Esposito, L. W., Cooney, J. H., Jerousek, R. G., Lissauer, J. J., Stewart, G. R., Sremcevic, M.: Mass and Thickness of the Cassini Division in Saturn’s Rings. Bradley: Composition and size properties of Saturn's rings determined from ultraviolet measurements made by the Cassini Ultraviolet Imaging Spectrograph COSPAR in Montreal, July 2008 Colwell: Vertical Structure of Saturn's Rings from Cassini UVIS Stellar Occultations, Colwell, J. E., Esposito, L. W., Jerousek, R., Lissauer, J. J. Esposito: Structure and history of Saturn’s rings from Cassini-UVIS Observations Hansen: Exploration of a New World: Saturn's moon Titan Pryor: Lyman-alpha observations of Comet Holmes from SORCE SOLSTICE and SOHO SWAN, W. Pryor, M. Snow, and E. Quemerais. (re: cross-calibrating UV instruments) The Science of Solar System Ices workshop in Oxnard, CA, May 2008 Hendrix and Hansen: UV Spectra of the Icy Moons of Jupiter and Saturn. Saturn After Cassini/Huygens workshop in London, July 2008 Albers, N., Sremcevic, M., Esposito, L.W.: Saturn’s F ring: Observations by Cassini UVIS Colwell : Ring Structure, Colwell, J. E., French, R. G., Marouf, E. A., Murray, C. D., Nicholson, P. D., Tiscareno, M. S. Esposito : Structure and history of Saturn’s rings from Cassini-UVIS Observation Hendrix and Hansen: Ultraviolet Spectroscopy of the Surfaces of the Saturnian Satellites Ring Workshop, July 2008, Paris, France Albers.: F ring models EGU, April 2008, Vienna Austria Yung: Evolution andOrigin of Titanﾕs Atmosphere Yung: Habitability of Enceladus:Planetary Conditions for Life

UVIS: Outreach - 2008 #: Press releases None #: Press conferences & interviews #: EPO: Talks to school children, teachers and public Esposito: History of Saturn’s Rings, Ball Aerospace, June 27 Esposito: History of Saturn’s Rings, Oulu University, Finland, May 16 Liu: Experimental and coupled-channels investigations of N2 radiative properties for analysis of FUSE day glow observation, Caltech graduate students. June 10. Hansen: The Discovery of Enceladus’ Water Vapor Plume, California Institute of Technology Alumni Seminar, May, 2008, Pasadena, CA