Uranus at equinox: Cloud morphology and dynamics

  title={Uranus at equinox: Cloud morphology and dynamics},
  author={L. Sromovsky and P. Fry and H. Hammel and William K. M. Ahue and I. Pater and K. Rages and M. Showalter and M. V. Dam},
Abstract As the 7 December 2007 equinox of Uranus approached, collaboration between ring and atmosphere observers in the summer and fall of 2007 produced a substantial collection of ground-based observations using the 10-m Keck telescope with adaptive optics and space-based observations with the Hubble Space Telescope. Both near-infrared and visible-wavelength imaging and spatially resolved near-infrared spectroscopic observations were obtained. We used observations spanning the period from 7… Expand
Post-equinox dynamics and polar cloud structure on Uranus ☆
Abstract Post equinox imaging of Uranus by HST, Keck, and Gemini telescopes has enabled new measurements of winds over previously sampled latitudes as well as measurements at high northern latitudesExpand
Further seasonal changes in Uranus' cloud structure observed by Gemini-North and UKIRT
Abstract Near-infrared observations of Uranus were made in October/November 2010 with the Gemini-North telescope in Hawaii, using NIFS, an integral field spectrograph, and the NIRI instrument inExpand
Spectral analysis of Uranus’ 2014 bright storm with VLT/SINFONI
Abstract An extremely bright storm system observed in Uranus’ atmosphere by amateur observers in September 2014 triggered an international campaign to observe this feature with many telescopes acrossExpand
Uranus’ cloud structure and seasonal variability from Gemini-North and UKIRT observations
Abstract Observations of Uranus were made in September 2009 with the Gemini-North telescope in Hawaii, using both the NIFS and NIRI instruments. Observations were acquired in Adaptive Optics mode andExpand
Record-breaking storm activity on Uranus in 2014
Abstract In spite of an expected decline in convective activity following the 2007 equinox of Uranus, eight sizable storms were detected on the planet with the near-infrared camera NIRC2, coupled toExpand
Detection and Tracking of Subtle Cloud Features on Uranus
The recent discovery of low-contrast cloud that can be revealed by imaging at much higher signal-to-noise ratios (S/Ns) than previously obtained is demonstrated using an average of 2007 Keck II NIRC2 near-IR observations. Expand
Vertical cloud structure of Uranus from UKIRT/UIST observations and changes seen during Uranus’ northern spring equinox from 2006 to 2008
Abstract Long-slit spectroscopy observations of Uranus by the United Kingdom Infrared Telescope UIST instrument in 2006, 2007 and 2008 have been used to monitor the change in Uranus’ vertical andExpand
Atmospheric Dynamics and Vertical Structure of Uranus and Neptune’s Weather Layers
The Icy Giants Uranus and Neptune have similar rotation periods, large orbital inclinations and intense zonal winds at the visible cloud level. The winds are organized into three broad jets: a zonalExpand
Clouds and aerosols on Uranus: Radiative transfer modeling of spatially-resolved near-infrared Keck spectra
Abstract We observed Uranus in the near-infrared H and K′ bands (1.47–2.38  μ m) in 2010 and 2011 with the OSIRIS imaging spectrograph on the Keck II telescope with adaptive optics. In 2010, threeExpand
Longitudinal Variations in the Stratosphere of Uranus from the Spitzer Infrared Spectrometer
NASA’s Spitzer Infrared Spectrometer (IRS) acquired mid-infrared (5-37 μm) disc-averaged spectra of Uranus very near to its equinox in December 2007. A mean spectrum was constructed from observationsExpand


Dynamics, evolution, and structure of Uranus' brightest cloud feature ☆
Abstract The brightest cloud feature ever observed on Uranus at near-infrared wavelengths was detected on 14 and 15 August 2005, in images obtained with the NIRC2 instrument and adaptive optics (AO)Expand
Uranus in 2003: Zonal winds, banded structure, and discrete features
Abstract Imaging of Uranus in 2003 with the Keck 10-m telescope reveals banded zonal structure and dozens of discrete cloud features at J and H bands; several features in the northern hemisphere areExpand
New Measurements of the Winds of Uranus
Abstract Hubble Space Telescope imaging of Uranus in 1994, 1997, 1998, and 2000 revealed 13 cloud features, allowing the first measurements of wind velocities at northern latitudes not accessible toExpand
Dynamics of cloud features on Uranus
Abstract Near-infrared adaptive optics imaging of Uranus by the Keck 2 telescope during 2003 and 2004 has revealed numerous discrete cloud features, 70 of which were used to extend the zonal windExpand
Latitudinal variations in Uranus' vertical cloud structure from Ukirt UIST observations
Prior to Uranus' northern spring equinox in 2007 December, near-infrared spectra and images of Uranus were obtained in 2006 August and September using the UIST instrument on the United KingdomExpand
Latitudinal variations in Uranus' vertical cloud structure from UKIRT UIST observations
Prior to Uranus' northern spring equinox in 2007 December, near-infrared spectra and images of Uranus were obtained in 2006 August and September using the UIST instrument on the United KingdomExpand
Uranus atmospheric dynamics and circulation
Uranus, with its 98° obliquity, apparently negligible internal heat source and methane-enriched, hydrogen-helium atmosphere, is a unique study in planetary meteorology. Although Voyager imagingExpand
Voyager 2 in the Uranian System: Imaging Science Results
Voyager 2 images of the southern hemisphere of Uranus indicate that submicrometersize haze particles and particles of a methane condensation cloud produce faint patterns in the atmosphere. TheExpand
Evidence for temporal change at Uranus' south pole
Abstract Analysis of Hubble Space Telescope images of Uranus taken between 1994 and 2002 shows evidence for temporal changes in zonal brightness patterns in the south polar region. Between 1994 andExpand
The atmosphere of Uranus: Results of radio occultation measurements with Voyager 2
During Voyager 2's occultation by Uranus the radio link from the spacecraft probed the atmosphere of the planet at latitudes ranging from 2° to 7° south. The measurements, which were conducted at twoExpand