NASA Quarterly
UVIS
Q4 - 2011
(Aug - Oct 2011)
Quarterly
1
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UVIS: Science Highlight
On 19 October 2011 the Cassini UVIS will observe two of the three stars in Orion’s belt as they pass behind Enceladus’ water vapor plume. The path of the
stars will cross the plume horizontally, with the closer of the two at an altitude of ~18 km from Enceladus’ limb and the other at ~39 km. This geometry
gives us the opportunity to determine the vertical and horizontal dimensions of the jets in Enceladus’ plume simultaneously. The structure of the jets is a
key dataset that models of the eruptive activity internal to Enceladus, hidden to Cassini, must predict.
This will be the 5th (and last) Enceladus plume occultation observed by Cassini. Two stellar occultations in 2005 established water as the dominant
constituent, determined the source rate, and constrained the plume’s latitudinal extent. A stellar occultation in 2007 detected supersonic gas jets that
appear to correlate with the dust jets observed in images. A solar occultation in 2010 put upper limits on the amount of N 2 in the plume and yielded the best
structure of the jets to-date.
Quarterly
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UVIS: Accomplishments
• Publications
– Published this quarter
1
–
In press (Went into press Aug - Oct and also includes still in press from earlier quarters)
9
–
Submitted (Submitted Aug - Oct and also includes submitted earlier and still in review)
8
–
Published 2011 to date
12
–
Published entire mission
132
• Presentations at scientific conferences (Aug - Oct 2011)
–
16 papers at EPSC/DPS 2011, Nantes, France, October 2011 (Albers, Baillie, Bradley, Colwell [4], Esposito,
Hendrix, Shemansky [3], Sremcevic, West, Yung [2])
• Public Outreach and Press Activities (Aug - Oct 2011)
–
–
–
Quarterly
0: public talks
1: press release Hansen/Cassidy.
0: press conferences (phone interviews)
3
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UVIS: Plans
– Science Plans (Nov 2011 - Jan 2012)
•
Bradley: Continue investigation of ring particle albedo in the FUV
•
Bradley: Design observations for rings spectroscopy in the FUV during available times determined with the Cassini rings
working group.
•
Colwell: Write paper on occultation statistics
•
Colwell: Write paper on updated self-gravity wakes model and fit to data
– Publications (Nov 2011-Jan 2012) In preparation (includes submitted, but not yet published)
•
1 paper in review at ApJL
•
1 paper in review in Astrophys. J.
•
1 paper in press at GRL.
•
1 paper in press in the proceedings book of the IAU Symposium 263
•
3 papers in press and 4 papers in review in Icarus
•
3 papers in press at JGR
•
1 paper in review in J. Phys. B.
•
1 papers in press in Planet. Space. Sci.
•
1 chapter in review in the book Titan: Surface, Atmosphere and Magnetosphere
17
– Upcoming presentations at scientific conferences (Nov 2011 - Jan 2012)
•
3 papers at AGU, San Francisco, CA, December 2011 (Esposito, Hansen, Hendrix)
– Public Outreach and Press Activities (Nov 2011 - Jan 2012)
Quarterly
•
0: public talks
•
0: press releases
•
0: press conferences (phone interviews)
4
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Backup Material
Quarterly
5
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UVIS: Publications - 2011
•
Ajello, J.M., R.S. Mangina, R.R. Meier. 2010. UV Molecular Spectroscopy from Electron Impact for Applications to Planetary
Atmospheres and Astrophysics. Eds., Y. Hatano, Y. Katsumura, and A. Mozumder, In Charged Particle and Photon Interactions with
Matter, Recent Advances, Applications, and Interfaces, Taylor & Francis, Boca Raton. (Published December 13, 2010 but missed Q1
report)
•
Colwell, J. E., L. W. Esposito, R. G. Jerousek, M. Sremcevic, D. Pettis, and E. T. Bradley. 2010. Cassini UVIS Stellar Occultations of
Saturn’s Rings. Astron. J. Volume 140, Issue 6, pp. 1569-1578. (published 12/10)
•
Croteau, P., J. B. Randazzo, O. Kostko, M. Ahmed, M.-C. Liang, Y. L. Yung, and K. A. Boering (2011). Measurements of isotope effects
in the photoionization of N2 and implications for Titan’s atmosphere, Astrophys. J. Lett. 728 L32. doi:10.1088/2041-8205/728/2/L32
(published February 2011)
•
Elliott, J.P. and L.W. Esposito. 2010. Regolith Depth Growth on an Icy Body Orbiting Saturn and Evolution of Bidirectional Reflectance
due to Surface Composition Changes. Icarus. (Published 12/2010)
•
Gerard, J.-C., B. Hubert, J. Gustin, V. I. Shematovich, D. Bisikalo, L. Esposito, A.I. Stewart, 2010. EUV spectroscopy of the Venus
dayglow with UVIS on Cassini. Icarus (In press Sept. 2010)
•
Hansen, C. J., D. E. Shemansky, L. W. Esposito, A. I. F. Stewart, B. R. Lewis, J. E. Colwell, A. R. Hendrix, R. A. West. 2011. The
Composition and Structure of the Enceladus Plume. GRL. 38, L11202, doi:10.1029/2011GL047415. (Published 6/9/11)
•
Hedelt, P., Ito, Y., Keller, H.U., Lammer, H., Rauer, H., Reulke, R., Wurz, P., Esposito, L. 2010. Titan’s atomic hydrogen corona. Icarus,
Volume 210, Issue 1, p. 424-435 (Published 11/2010)
•
Mangina, R..S., J. M. Ajello, R. A. West, and D Dziczek. 2011. High-resolution electron-impact emission spectra and vibrational emission
cross sections from 330-1100 nm for N2. ApJS. 196:13. (published September 2011)
•
Pryor W.R., A.M. Rymer, D.G. Mitchell, T.W. Hill, D.T. Young, J. Saur, G.H. Jones, S. Jacobsen, S.W.H. Cowley, B.H. Mauk, A.J.
Coates, J. Gustin, D. Grodent, J.-C. Gerard, L. Lamy, J. D. Nichols, S.M. Krimigis, L.W. Esposito, M.K. Dougherty, A.. Jouchoux, A.I.F.
Stewart, W.E. McClintock, G.M. Holsclaw, J.M. Ajello, J.E. Colwell, A.R. Hendrix, F.J. Crary, J.T. Clarke, X. Zhou. 2011. The Enceladus
auroral footprint at Saturn. Nature. (To be published in the Apr 21 issue, but missed Q1 report)
•
Stevens, M.H., J. Gustin, J.M. Ajello, J.S. Evans, R.R. Meier, A. J. Kochenash, A.W. Stephan, A.I.F. Stewart, L.W. Esposito, W.E.
McClintock, G. Holsclaw, E. T. Bradley, B.R. Lewis. 2011. The Production of Titan’s Far Ultraviolet Nitrogen Airglow. JGR. 116, A05304.
(Published May 5, 2011)
Continued next page…
Quarterly
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UVIS: Publications - 2011
•
Xu, F, A. B. Davis, R. A. West and L. W. Esposito. 2011. Markov chain formalism for polarized light transfer in plane-parallel
atmospheres, with numerical comparison to the Monte Carlo method. Optics Express. Vol. 19, 2, 946-967. (In press Dec. 20, 2010)
•
Zhang X., Ajello, J.M., and Yung, Y.L. 2009. Atomic carbon in the upper atmosphere of Titan. ApJL. 708, 1, L18-L21. (Published 2010,
but missed Q1 report.)
Quarterly
7
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UVIS: Publications (In Press)
•
Ajello, J.M, R. S. Mangina, D. J. Strickland, D. Dziczek. 2010. Laboratory studies of UV emissions from proton impact on N2: The
Lyman-Birge-Hopfield Band System for aurora analysis. JGR. (Accepted January 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. doi: 10.1016/j.icarus.2011.05.019. in preparation, anticipated submission in October 2010, (went into review Dec. 2010)
•
Esposito, L.W.E., Albers, N., Meinke, B.K., Sremcevic, M., Colwell, J.E. 2010. Moon-triggered Clumping in Saturn’s Rings. Icarus. (Submitted October 2,
2009)
•
Gerard, J.-C., J. Gustin, B, Hubert, G.R. Gladstone and L.W. Esposito. 2011. Measurements of the Helium 584‐ﾅ airglow during the
Cassini flyby of Venus. Planetary Space Sci. (Accepted on July 1, 2011)
•
Grodent, D., J. Gustin, J.-C. Gerard, A. Radioti, B. Bonfond, and W. Pryor, Small scale structures in Saturn's ultraviolet aurora, J.
Geophys. Res., doi:10.1029/2011JA016818, in press. (accepted to JGR. - don’t know all authors or date accepted, email to Wayne 7/5.
doi:10.1029/2011JA016818 (in press June 28 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. DOI: 10.1017/S1743921310001626 (In press Dec. 2009, (Published online: 06 Apr 2010)
•
Jerousek, R. G., Colwell, J. E., Esposito, L. W. 2010. Morphology and Variability of Sharp Edges in Saturn's Rings. Icarus (In press
September 2011).
•
Melin, H., T. Stallard, S. Miller, J. Gustin, M. Galand, S.V. Badman, W. Pryor, J. O'Donoghue, R. H. Brown, and K. H. Baines.
Simultaneous Cassini VIMS and UVIS observations of Saturn’s southern aurora—comparing emissions from H, H2, and H3+ at a high
spatial resolution GRL. (In press July 5, 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. (In press in August 2011)
Quarterly
8
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UVIS: Publications (Submitted)
•
Albers, N, M. Sremcevic, J.E. Colwell, and L.W. Esposito. 2009. Saturn’s F Ring as seen by Cassini UVIS: Kinematics and Statistics.
Icarus. (Resubmitted September 2011)
•
Guimaraes, A.H.F., Spahn, F., Seiss, M., Albers, N., Vieira-Neto, E., Brilliantov, N.V. 2011. Aggregates in Saturn's rings under strength
regime. Icarus (Anticipate submission beginning/middle of October 2011)
•
Hendrix, A. R., T. A. Cassidy, C. Paranicas, C. J. Hansen 2011. The Albedo Pattern of Mimas as measured by Cassini UVIS. Icarus.
(Submitted August 2011).
•
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.)
•
Liu, X., D. E. Shemansky, P. V. Johnson, C. P. Malone, and I. Kanik. 2011. Electron and photon dissociation cross sections of H2 singletungerade continua. J. Phys. B. (Submission expected in October 2011)
•
Meinke, B.K., L. W Esposito, N. Albers, M. Sremcevic, C. Murray. 2011. Classification of F ring features observed in Cassini UVIS
occultations. Icarus. (Submitted February 2011)
•
West, R., C. Anderson, H. Imanaka and P. Lavvas. 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 (Submission expected in October 2011)
Quarterly
9
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UVIS: Theses Completed
•
J. M Yoshii, “Energy balance in the core of the Saturn plasma sheet“, Delivered to the USC Graduate School Sep
7, 2011
Quarterly
10
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UVIS: Science Presentations - Q4-2011 (Aug-Oct 2011)
–
EPSC/DPS 2011, Nantes, France, October 2011
•
Albers, N., M. Sremcevic, and L.W. Esposito: A Cassini UVIS survey of the Saturnian ring edges
•
Baillie, K., J. E. Colwell, and L. W. Esposito: Meter-sized Boulder Population in Saturn's C Ring and Cassini Division.
•
Bradley, E. T., J. E. Colwell, and L. W. Esposito: Physical Properties of Saturn's Rings Derived from Cassini UVIS Far Ultraviolet Reflectance
Spectra.
•
Colwell [4]
– Colwell, J. E., J. H. Cooney, and L. W. Esposito: Particle Size Variations in Saturn's Rings from Occultation Statistics.
– Bolin, B., and J. Colwell: Cassini UVIS Observations of Saturn's Faint, Narrow Ringlets.
– French, R. G., P. D. Nicholson, J. Colwell, E. A. Marouf, N. J. Rappaport, M. Hedman, K. Lonergan, C. McGhee-French, and T.
Sepersky: Noncircular Features in Saturn's Rings: 1. The Cassini Division.
– Nicholson, P. D. , R. G. French, M. M. Hedman, E. A. Marouf, J. E. Colwell, N. Rappaport, T. L. Sepersky, and K. R. Lonergan:
Noncircular Features in Saturn's Rings: 2. The C Ring.
•
Esposito, L. W., N. Albers, B. K. Meinke, M. Sremcevic,P. Madhusudhanan, J. E. Colwell, and R. E. Jerousek:. A Predator-Prey Model For MoonTriggered Clumping in Saturn's Rings.
•
Hendrix: Weathering Effects on the Icy Saturnian Moons: UVIS Results.
•
Shemansky [3]
– Energy balance in the core of the Saturn plasma sheet: H2O chemistryJ. Yoshii , D. E. Shemansky, X. Liu (EPSC-DPS2011-1707)
– Energy balance in the core of the Saturn plasma sheet: H2O chemistryJ. Yoshii , D. E. Shemansky , X. Liu (EPSC-DPS2011-1659)
– Probing Titan’s Upper Atmosphere: Observations from Cassini UVISJ. A. Kammer, D. E. Shemansky, X. Zhang, and Y. L. Yung
•
Sremcevic, M., L. W. Esposito, J. E. Colwell, and N. Albers: B Ring Gray Ghosts in Cassini UVIS Occultations.
•
West, R.A., J. M. Ajello, M.H. Stevens, J. S. Evans and R. S. Mangina: Airglow emission from Titan during eclipse
•
Yung [2]
– Liang, M.-C., X Zhang, R.I. Kaier, and Y.L. Yung - Updated Polyyne Chemistry for Polyyne Polymerization and Organic Aerosol
Synthesis in the Atmosphere of Titan
– Kammer, J. A. , X. Zhang1 M.-C. Liang, D. E. Shemansky and Y. L. Yung - Observations and Modeling of Hydrocarbons and Tholin in
the Upper Atmosphere of Titan.
Quarterly
11
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UVIS: Outreach - Q4-2011 (Aug-Oct 2011)
• #: EPO: Talks to school children, teachers and public
–
None this quarter
• #: Press releases
–
Saturn's Moon Enceladus Spreads Its Influence, Sept. 21, 2011
http://www.jpl.nasa.gov/news/news.cfm?release=2011-299
• #: Press conferences & interviews
–
None this quarter
Quarterly
12
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