NASA Quarterly UVIS Q4 - 2012 (Aug – Oct 2012)

UVIS: Science Highlights This clear filter Imaging Subsystem camera image (A) shows Titan in partial eclipse and illuminated by light reflected around the edge of Saturn and its rings, which are downward. Background star trails and cosmic ray events are apparent. With light from Saturn and the rings subtracted (B) and the intensity enhanced, a glow is seen emanating from both shaded and illuminated regions of the atmosphere. The grid overlay shows the location of the south pole and the dashed circles show the top of Titan’s haze layer at 300 km (190 miles) altitude and the top of a fainter airglow layer extending to 1000 km (625 miles) altitude.

UVIS: Accomplishments Science Highlights (from this quarter: Aug – Oct2012) EUV and FUV emissions from N and N2 were observed at one of three eclipse events. Only the strongest emissions were observed, relative to what is seen from the illuminated atmosphere.

UVIS: Accomplishments Publications Published this quarter 3 In press (Went into press Aug-Oct, 2012 and also includes still in press from earlier quarters) 3 Submitted (Submitted Aug-Oct, 2012 and also includes submitted earlier and still in review) 8 Published 2012 to date (since Nov. 2011) 11 Published entire mission 152 Presentations at scientific conferences (Aug-Oct 2012) 4 papers EPSC in Madrid, Spain, September 23-28, 2012 (Gustin (2), Hendrix, Lavvas) 9 papers at DPS in Reno, NV, October 14-19, 2012 (Bradley, Colwell (6), Esposito, Keller) 1 paper at ISSI meeting on Comparative Jovian Aeronomy in Bern Switzerland, Sept 10-14, 2012, (Gustin) Public Outreach and Press Activities (Aug-Oct 2012) 0: public talks 0 : press releases 0: press conferences (phone interviews)

UVIS: Plans Science Plans (Nov 2012-Jan 2013) Bradley: Continue investigation of ring particle albedo Bradley: Compare Saturn ring spectra with Saturn icy moon spectra Colwell: Paper on ghosts by Baillié submitted to Astron. J. requires significant revisions. Will work on this next quarter. Colwell: Paper on faint and narrow rings is in production (student Bryce Bolin is lead author). Colwell: Paper on occultation statistics is in production (Colwell lead author). Colwell: New paper on self-gravity wakes is in preparation (Colwell lead author). Colwell: Submit new and updated occultation data sets to the Planetary Data System. Colwell: Paper on analysis of Rev 9 solar occ diffraction signal from F ring is in preparation (student Becker is lead author). Publications (Nov 2012-Jan 2013) In preparation (includes submitted, but not yet published) 11 1 paper in press in an AGU monograph on the auroras 1 paper in review in ApJL 1 paper in review in Astron. J 1 paper in review in Astrophys J 1 paper in review in GRL 2 papers in review and 1 in press in Icarus 2 papers in review in JGR 1 chapter in press in the book Titan: Surface, Atmosphere and Magnetosphere

UVIS: Plans Continued from last page Upcoming presentations at scientific conferences (Nov 2012-Jan 2013) 12 papers the AGU in San Francisco, Spain, December 3-7, 2012 (Baillie, Bradley, Colwell (5), Esposito, Hansen, Lavvas, Meike, West) Public Outreach and Press Activities (Nov 2012-Jan 2013) 0: public talk 0: press releases 0: press conference (phone interview)

Backup Material

UVIS: Publications - 2012 Albers, N, M. Sremcevic, J.E. Colwell, and L.W. Esposito. 2012. Saturn’s F Ring as seen by Cassini UVIS: Kinematics and Statistics. Icarus. Volume 217, p. 367-388, doi:10.1016/j.icarus.2011.11.016. (Published January 2012.) Esposito, L.S., N. Albers, B. K. Meinke, M. Sremcevic, Pr. Madhusudhanan, J. Colwell, R. G. Jerousek. 2012. A Predator-Prey Model for Moon-triggered Clumping in Saturn’s Rings. Icarus. 217, 1, 103-114. (Published Jan 2012) Guimaraes, A.H.F., Albers, N., Spahn, F., Seiss, M., Vieira-Neto, E., Brilliantov, N.V. 2012. Aggregates in the strength and gravity regime: Particle sizes in Saturn’s rings. Icarus. 220, 2, 660–678. (Published Aug 2012) Gustin, J., B. Bonfond, D. Grodent, and J.-C. Gérard. 2012. Conversion from HST ACS and STIS auroral counts into brightness, precipitated power, and radiated power for H2 giant planets. JGR, 117, A07316. (Published July 2012) Liu, X. and D. E. Shemansky, 2012. Nondissociative electron and photon ionization cross sections of molecular hydrogen and deuterium. J. Phys. B. 45, 095203 (15pp). doi:10.1088/0953-4075/45/9/095203.(Published April 2012) Liu, X., D. E. Shemansky, P. V. Johnson, C. P. Malone, M.A. Khakoo. 2012, Electron and photon dissociation cross sections of D2 Singlet-ungerade continua, J. Phys. B. 45, 105203. doi:10.1088/0953-4075/45/10/105203 (Published May 2012) Liu, X., D. E. Shemansky, P. V. Johnson, C. P. Malone, M.A. Khakoo and I. Kanik. 2012. Electron and photon dissociation cross sections of H2 singlet-ungerade continua. J. Phys. B. 45 015201 doi:10.1088/0953-4075/45/1/015201. (Published January 2012) Meinke, B.K., L. W Esposito, N. Albers, M. Sremcevic. 2012. Classification of F ring features observed in Cassini UVIS occultations. Icarus, 218, 1, p.545-554, doi:10.1016/j.icarus.2011.12.020 (Available online 19 January 2012, in print March 1, 2012) Shemansky, D. E., and X. Liu. 2012. Saturn Upper Atmospheric Structure from Cassini EUV/FUV Occulations, Can. J. Phys. 90: 817–831. (Published Aug 2012) West, R.A, J.M. Ajello, M. H. Stevens, D. F. Strobel, G. R. Gladstone, J.S. Evans, E.T. Bradley. 2012. Titan Airglow During Eclipse. GRL. 39, L18204, (Published Sept 2012) Zastrow, M, Clarke, J. T., Hendrix, A.R., Noll, K.S. 2012. UV spectrum of Enceladus. Icarus. 220: 29-35. (Published May 2012)

UVIS: Publications UPDATE The following papers were published between 2010-2011, however we did not know in time to include in previous quarterly reports. Ajello, J.M, R. S. Mangina, D. J. Strickland, D. Dziczek. 2011. Laboratory studies of UV emissions from proton impact on N2: The Lyman-Birge-Hopfield Band System for aurora analysis. JGR. Vol. 116, A00K03, 21 PP., 2011. doi:10.1029/2010JA016103 (Published April 19, 2011) Baillie, K., J. E. Colwell, J. J. Lissauer, L. W. Esposito, M. Sremcevic. 2011. Waves in Cassini UVIS Stellar Occultations 2. Waves in the C Ring. Icarus. 216, 1, 292–308. doi: 10.1016/j.icarus.2011.05.019. (Published November 2011) Gerard, J.-C., J. Gustin, B, Hubert, G.R. Gladstone and L.W. Esposito. 2011. Measurements of the Helium 584‐Å airglow during the Cassini flyby of Venus. Planetary Space Sci. 59, 13, 1524–1528. (Published October 2011) Hendrix, A.R. and C. J. Hansen. 2010. The Surface Composition of Enceladus: Clues from the Ultraviolet. Proceedings book of the IAU Symposium 263. Volume 5, pp 126-130, Symposium S263. DOI: 10.1017/S1743921310001626, DOI: 10.1017/S1743921310001626 (Published online only: 06 Apr 2010) Jerousek, R. G., Colwell, J. E., Esposito, L. W. 2011. Morphology and Variability of Sharp Edges in Saturn's Rings. Icarus. 216, 1, Pages 280–291. (Published November 2011). Radioti, A., D. Grodent, J.-C. Gerard, S. E. Milan, B. Bonfond, J. Gustin, and W. Pryor. 2011. Bifurcations of the main auroral ring at Saturn: ionospheric signatures of consecutive reconnection events at the magnetopause. JGR. 116, A11209, 8 PP, doi:10.1029/2011JA016661. (Published November 10, 2011)

UVIS: Publications (In Press) Gurnett, D. and W. Pryor. 2012. Auroral Processes Associated with Saturn's Moon Enceladus. For inclusion in an AGU monograph on the auroras. (In press spring 2012) Hendrix, A. R., T. A. Cassidy, B.J. Buratti, C. Paranicas, C. J. Hansen, B.D. Teolis, E. Roussos, P.Kollmann, T. Bradley, R. Johnson. 2012. Mimas’ Far-UV Albedo: Spatial Variations. Icarus. (In press June 2012) West, R., P. Lavvas, C. Anderson, and H. Imanaka. 2012. Titan Haze. A chapter in Titan: Surface, Atmosphere and Magnetosphere. Eds. I. Mueller-Wodarg, C. Griffith, T. Cravens and E. Lellouch. Cambridge University Press [Cambridge Planetary Science Series]. (In press March 1, 2012)

UVIS: Publications (Submitted) Ajello, J.M, M.H. Stevens, J. Gustin, K. Larsen, A.I.F. Stewart, L.W. Esposito, W.E. McClintock, G.M. Holsclaw, E.T. Bradley. 2012. Cassini UVIS Observations of Titan Nightglow Spectra. JGR. (Submitted May 1) Baillié, K., Colwell, J. E., Esposito, L. W. 2012. Meter-sized moonlet population in Saturn’s C ring and Cassini Division. Astron. J. (Submitted July 2012) Bradley, E.T., J.E. Colwell, L.W. Esposito, 2012. Scattering properties of Saturn’s rings from Cassini UVIS spectra. Icarus. (Submitted August 2012) Carbary, J., D. Mitchell, and W. Pryor. 2012. Correlation of Saturn's Ultraviolet Aurora with Energetic Neutral Atoms. GRL.  (Submitted June 28, 2012) Hubert, B., J.-C. Gerard, J. Gustin, D.V. Bisikalo, V.I. Shematovich and R.G. Gladstone. 2012. Cassini-UVIS observation of dayglow FUV emissions of carbon in the thermosphere of Venus. Icarus. (Submitted in December 2011 but didn’t know in time for Q1 report). Jackman, C.M., N. Achilleos, S.W.H. Cowley, E.J. Bunce, A. Radioti, D. Grodent, S.V. Badman, M.K. Dougherty, W. Pryor. 2012. Auroral counterpart of magnetic field dipolarizations in Saturn’s tail. JGR. (submitted February, 2012) Kammer, J. A., X. Zhang, M.-C. Liang, D. E. Shemansky and Y. L. Yung. 2011. Observations and Modeling of Hydrocarbons and Tholin in the Upper Atmosphere of Titan. ApJL. (Submitted Sep 27, 2011) Liang, M. C., A. S. Wong, D. Henze, M. Adamkovics, K. Boering and Y. L. Yung. 2011. Synergistic study of hydrocarbon photochemistry in the laboratory and the atmosphere of Titan, Astrophys. J. (In Revision.)

UVIS: Science Presentations – Q3-2012 (Aug-Oct 2012) EPSC, Madrid Spain, September 23-28 Gustin (2): “Saturn temperature profiles at low, medium and high latitudes derived from UVIS EUV Solar occultations” and “Conversion from HST ACS and STIS auroral counts into brightness, precipitated power and radiated power for H2 giant planets” Hendrix: "Seasonal Variations on Saturn's Moons Mimas and Tethys.” Lavvas: "Particle charging: its role in the ionospheric composition and the growth of aerosols” DPS, Reno NV, October 14-29 Bradley: “Analysis of Cassini UVIS Far Ultraviolet Reflectance Spectra to constrain the non-ice material in Saturn’s rings and icy moons” Colwell: “Particle Sizes and Small-Scale Structure in Saturn’s Rings from Stellar Occultation Statistics” (Colwell, Joshua E., J. H. Cooney, Larry W. Esposito, M. Sremcevic) “Saturn’s F Ring Core: Calm in the Midst of Chaos” (Cuzzi, Jeffrey N., Akbar Whizin, R. C. Hogan, A. Dobrovolskis, Joshua Colwell, Jeff Scargle, Luke Dones, Mark Showalter) “Particle Sizes in Saturn’s F ring and Strands from Cassini Solar Occultation” (Becker, Tracy M., J. E. Colwell, Larry W. Esposito) “Low-Energy Impacts onto Lunar Regolith Simulant” (Seward, Laura M., Joshua E. Colwell, Michael T. Mellon, and Bradley T. Stemm) “Analysis of a Triple Star System Occulted by Saturn’s Rings” (Bratcher, Allison, Joshua E. Colwell) “Growth and Destruction from Low-Velocity Dust Aggregate Collisions”(Dove, Adrienne, Joshua Colwell, Christopher Vamos. ) Esposito: “Haloes seen in UVIS reflectance spectra” (LW Esposito, ET Bradley, JE Colwell, M Sremcevic) Keller: “Photometric observations of interstellar hydrogen by HDAC: in-flight calibrations and first results” (.H.U. Keller, Y. Skorov, O. Katushkina, V. Izmodenov, R. Reulke, K.-H. Glassmeier) ISSI meeting on Comparative Jovian Aeronomy, Bern Switzerland, Sept 10-14 Gustin: “Saturn temperature profiles at low, medium and high latitudes derived from UVIS EUV Solar occultations”

UVIS: Outreach – Q3-2012 (Aug-Oct 2012) EPO: Talks to school children, teachers and public Bradley: “Spectroscopic Analysis of Saturn’s Rings and Future Laboratory Investigations of Icy Material”, Florida Space Institute, University of Central Florida, Orlando, September 5, 2012 Colwell: “Saturn’s Rings as a Laboratory for Planet Formation”, Stetson University Physics Department Colloquium, DeLand FL, Oct. 1, 2012 (20 in attendance). Hansen: "Exploration of the solar system” - 3 talks, Dixie High School, St. George, UT (for Junior ROTC), Aug 22 & 23 Hansen: "Exploring Saturn with the Cassini Mission” - 3 talks, Dixie High School, St. George, UT (for Junior ROTC), October 3 & 4 Press releases None this quarter Press conferences & interviews