NASA Quarterly
UVIS
Q3 - 2013
(May – July 2013)
Quarterly
1
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UVIS: Science Highlights
This graph shows the optical depth of the largest density wave in Saturn’s rings (the Janus 2:1 density wave) in
red, and a mean particle size calculated from variance of the occultation data (blue). The blue curve dips at the
peaks of the density wave indicating that small particles are knocked off larger particles in strong collisions in those
waves, while in the troughs the particles are larger due to clumping. (Colwell)
Quarterly
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UVIS: Accomplishments
Science Highlights (from this quarter: May – July 2013)
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Colwell: Analysis of ring stellar occultation statistics (the variance of the data) shows the production
of small particles in density wave peaks presumably due to more vigorous collisions in those
regions. The variance also shows smaller particles in the so-called haloes around the strongest
density waves in the A ring, demonstrating a link between particle size and spectral properties
associated with these waves.
–
Colwell: A comparison of UVIS and VIMS optical depths in the rings using stellar occultation data
shows that VIMS sees a different optical depth due to their longer wavelength of observation and
smaller field of view. We have utilized this to improve our model of self-gravity wakes in the rings
and derive from the combined data the fraction of small particles (sub-cm) in the gaps between the
self-gravity wakes across the A ring.
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UVIS: Accomplishments
• Publications
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Published this quarter
5
In press (Went into press May – July 2013, also includes still in press from earlier quarters)
6
Submitted (Submitted May – July 2013, also includes submitted earlier and still in review)
3
Published 2013 to date (since Nov. 2012)
10
Published entire mission
163
SPECIAL NOTE: Since its online publication on Oct 12, 2009, there have been 5667 chapter downloads for the book “'Saturn
from Cassini-Huygens” on SpringerLink. This means the book was one of the top 25% most downloaded eBooks in the
relevant Springer eBook Collection in 2012. (Dougherty, Esposito, Krimigis, (Eds.): http://tinyurl.com/pudpjjd )
• Presentations at scientific conferences (May – July 2013)
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1 presentation at Ice and Planet Formation Workshop, Lund, Sweden, May 15-17 (Albers)
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1 presentation at Davos Atmosphere and Cryosphere Assembly (DACA-13), Davos, Switzerland, July 8-12,
2013 (Esposito)
1 presentation at Asia Oceania Geosciences Society (AOGS), Brisbane, Australia, June 24-28, 2013
(Shemansky)
– 1 presentation at MOP, Athens, Greece, July 8-12 (Radioti)
– 1 presentation at Dusty Visions, Stuttgart, Germany, July 18 (Esposito)
• Public Outreach and Press Activities (May – July 2013)
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Quarterly
1: public talk
0 : press releases
0: press conferences (phone interviews)
4
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UVIS: Plans
– Science Plans (Aug – Oct 2013)
•
Bradley: Continue investigation of ring particle albedo
•
Bradley: Compare Saturn ring spectra with Saturn icy moon spectra
•
Bradley: Compositional modeling of ring particles using ring particle albedo and optical constants of candidate materials
•
Colwell: Finish paper on occultation statistics (Colwell lead author)
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Colwell: Continue work on new self-gravity wake model.
•
Colwell: Work with Becker on diffraction modeling. Begin paper preparation.
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Colwell: Paper on faint and narrow rings is in production (student Bryce Bolin is lead author).
•
Colwell: Paper on self-gravity wakes is in preparation (Colwell or Jerousek lead author).
•
Colwell: Submit new and updated occultation data sets to the Planetary Data System. [still pending per Josh]
•
Colwell: Paper on analysis of Rev 9 solar occ diffraction signal from F ring is in preparation (student Becker is lead
author).
•
Yung: UVIS spectra will be analyzed using a scattering radiative transfer code, including the spherical geometry involved
in the Cassini observations. The gaseous absorptions used in the radiative model will be taken from previous papers by
this group.
– Publications (Aug – Oct 2013) In preparation (includes submitted, but not yet published)
Quarterly
•
1 paper in press in an AGU monograph on the auroras
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2 papers in review in GRL
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1 paper in press in JGR- Space Physics
•
1 paper in press in J. Mol. Spectrosc.
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1 paper in press in Phys Rev D
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1 paper in review and 1 in press in Planet. Space Sci.
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1 chapter in press in the book Titan: Surface, Atmosphere and Magnetosphere
5
9
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UVIS: Plans
Continued from last page
–Upcoming presentations at scientific conferences (Aug – Oct 2013)
•
4 presentations at EPSC, London, September 8-13 (Colwell, Esposito, Hendrix, Radioti)
•
7 presentation at DPS, Denver, CO, October 2013 (Albers, Becker, Bradley, Colwell, Hendrix, Keller,
West )
–Public Outreach and Press Activities (Aug – Oct 2013)
Quarterly
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0: public talks
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0: press releases
•
0: press conference (phone interview)
6
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Backup Material
Quarterly
7
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UVIS: Publications - 2013
•
Ajello, J.M, West, R.A., 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. VOL. 117, A12315,
doi:10.1029/2012JA017888. (Published 12/22/12)
•
Badman, S. V., A. Masters, H. Hasegawa, M. Fujimoto, A. Radioti, D. Grodent, N. Sergis, M. K. Dougherty, and
A. J. Coates. 2013. Bursty magnetic reconnection at Saturn's magnetopause, Geophys. Res. Lett., 40. (published
March 2013, but found out this quarter.)
•
Baillié, K., Colwell, J. E., Esposito, L. W. and Lewis, M. C. 2013. Meter-sized moonlet population in Saturn’s C
ring and Cassini Division. Astron. J, 145, 171. (published May 2013)
•
Bradley, E.T., J.E. Colwell, L.W. Esposito, 2013. Scattering properties of Saturn’s rings from Cassini UVIS
spectra. Icarus, 225, 1, 726–739. (Published July 2013)
•
Brilliantov, N.V., N. Albers, F. Spahn, T. Pöschel. 2013. Erratum: Collision dynamics of granular particles with
adhesion [Phys. Rev. E 76, 051302 (2007)]. Phys. Rev. E 87, 039904(E), doi:10.1103/PhysRevE.87.039904
(Published March 2013)
•
Gérard, J.C., Gustin, J., Pryor, W.R., Grodent, D., Bonfond, B., Radioti, A., Gladstone, R.G., Clarke, J.T., Nichols,
J.D., 2013. Remote sensing of the energy of auroral electrons in Saturn’s atmosphere: Hubble and Cassini
spectral observations. Icarus, Vol. 223, Issue 1, 211–221. (Published March 2013.)
•
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. Icarus, 220 (2012) 922–931
(Published online July 2012, but found out April 2013.)
•
Hubert, B. ., J.-C. Gérard, 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. Volume 220, Issue 2, p.
635-646, doi: 10.1016/j.icarus.2012.06.002 (Published August 2012. Didn’t know in time for previous report).
Continued…
Quarterly
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UVIS: Publications - 2013
•
Jackman, C.M, N. Achilleos, S.W.H. Cowley, E.J. Bunce, A. Radioti, D. Grodent, S.V. Badman, M.K. Dougherty,
W. Pryor. 2013. Auroral counterpart of magnetic field dipolarizations in Saturn’s tail, PSS. V-82–83, 34–42.
(published July 2013)
•
Radioti A., E. Roussos, D. Grodent, J.-C. Gérard, N. Krupp, D. G. Mitchell, J. Gustin, B. Bonfond, and W. Pryor.
2013. Signatures of magnetospheric injections in Saturn's aurora, in press, JGR. 118, 5, 1922–1933. (published
May 2013)
Quarterly
9
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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. (Accepted spring 2012)
•
Gustin, J. , J.C. Gerard, D. Grodent, G.R. Gladstone, J.T. Clarke, W.R. Pryor, V. Dols, B. Bonfond, A. Radioti, L.
Lamy, J.M. Ajello. 2012. Effects of methane on giant planet's UV emissions and implications for the auroral
characteristics. J. Mol. Spectrosc. (Accepted. March 29, 2013.)
•
Kammer, J.A., D.E. Shemansky, X. Zhang, Y.L. Yung. 2013. Composition of Titan's Upper Atmosphere from
Cassini UVIS EUV Stellar Occultations. Planet. Space Sci. (Accepted 6/12/13.)
•
Lamy, L., Prange, R. Pryor, W., Gustin, J. Badman, S., Melin, H. Stallard, T., Mitchell, D.G., Brandt, P.C. 2013.
Multi-spectral simulations diagnosis of Saturn’s aurorae throughout a planetary rotation. JGR-Space Physics.
(Accepted June 17, 2013)
•
Torres, P.J., Madhusudhanan, P., Esposito, L.W. 2013. Mathematical analysis of a model for moon-triggered
clumping in Saturn's rings. Physical Review D. (Accepted June 3.)
•
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]. (Accepted March 1, 2012)
Quarterly
10
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UVIS: Publications (Submitted)
•
Carbary, J., D. Mitchell, and W. Pryor. 2012. Correlation of Saturn's Ultraviolet Aurora with Energetic Neutral
Atoms. GRL. (Submitted June 28, 2012)
•
Li, C., X. Zhang, M.-C. Liang, Y.L. Yung. 2013. Eddy Diffusion Profile of Titan's Atmosphere Revealed by Cassini
Observations. Planet. Space Sci. (Submitted Nov. 2012.)
•
Radioti, A., D. Grodent, J.-C. Gérard, B. Bonfond, and W. Pryor. 2013. Auroral signatures of multiple
magnetopause reconnection at Saturn, GRL (Submitted March 2013)
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UVIS: Science Presentations – Q3-2013 (May - July)
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Ice and Planet Formation Workshop, Lund, Sweden, May 15-17, 2013
•
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Asia Oceania Geosciences Society (AOGS), Brisbane, Australia, June 24-28,
2013
•
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Esposito: Icy jets from Enceladus
Dusty Visions, Stuttgart, Germany, July 18, 2013
•
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Shemansky, D., Melin, H., Liu, X., Yoshii, J.: Neutral Gas in the Saturn Magnetosphere
Davos Atmosphere and Cryosphere Assembly DACA-13, Davos, Switzerland, July
8-12, 2013
•
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Albers, N., Sremcevic, M., and Esposito, L.W.: Icy particles in Saturn's rings: theory and observations
by Cassini UVIS
Esposito: Predator-Prey Model for Haloes in Saturn’s Rings
Magnetospheres of the Outer Planets (MOP), Athens, Greece, July 8-12, 2013
•
Quarterly
Radioti, A., D. Grodent, J.-C. Gérard, J. Gustin, B. Bonfond and W. Pryor: Multi-instrument studies of
auroral processes at Saturn
12
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UVIS: Outreach – Q3-2013 (May – July 2013)
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•
EPO: Talks to school children, teachers and public
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Colwell: Seminar at Université Paris VII Denis Diderot, Paris, France. Seminar. May 3. Accretion in Saturn’s
Rings: Clues from Stellar Occultations and Experimental Studies
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Hansen: Invited talk at a celebration to commemorate the 10th anniversary of the Jack C. Davis Observatory,
Western Nevada College, May 3. Exploring Saturn and its Moons with the Cassini Mission.
Press releases
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None this quarter
Press conferences & interviews
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None this quarter
Quarterly
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