South-polar features on Venus similar to those near the north pole

@article{Piccioni2007SouthpolarFO,
  title={South-polar features on Venus similar to those near the north pole},
  author={Giuseppe Piccioni and Pierre Drossart and Agust{\'i}n S{\'a}nchez-Lavega and Ricardo Hueso and Fredric W. Taylor and C. F. Wilson and Davide Grassi and L. V. Zasova and Maria Luisa Moriconi and Alberto Adriani and S{\'e}bastien Lebonnois and Angioletta Coradini and Bruno B{\'e}zard and Francesco Angrilli and Gabriele Arnold and Kevin H. Baines and Giancarlo Bellucci and Johannes Benkhoff and J. P. Bibring and Armando Blanco and Maria I. Blecka and Robert W. Carlson and Andrea Maria di Lellis and Thérèse Encrenaz and St{\'e}phane Erard and Sergio Fonti and Vittorio Formisano and Thierry Fouchet and R. Garc{\'i}a and R. Haus and J. Helbert and Nikolay I. Ignatiev and Patrick G. J. Irwin and Y. Langevin and Miguel Angel Lopez‐Valverde and David Luz and Lucia Marinangeli and Vincenzo Orofino and Alexander V. Rodin and Maarten C. Roos-Serote and Bortolino Saggin and Daphne M. Stam and Dmitry Titov and Guido Visconti and Massimo Zambelli},
  journal={Nature},
  year={2007},
  volume={450},
  pages={637-640}
}
Venus has no seasons, slow rotation and a very massive atmosphere, which is mainly carbon dioxide with clouds primarily of sulphuric acid droplets. Infrared observations by previous missions to Venus revealed a bright ‘dipole’ feature surrounded by a cold ‘collar’ at its north pole. The polar dipole is a ‘double-eye’ feature at the centre of a vast vortex that rotates around the pole, and is possibly associated with rapid downwelling. The polar cold collar is a wide, shallow river of cold air… 
Winds and cloud morphology in the southern polar region of Venus
Spinning on average 60 times faster than the surface, the atmosphere of Venus is superrotational, a state in which the averaged angular momentum is much greater than that corresponding to co-rotation
Winds and cloud morphology in the southern polar region of Venus
  • D. Luz
  • Physics, Environmental Science
  • 2010
Spinning on average 60 times faster than the surface, the atmosphere of Venus is superrotational, a state in which the averaged angular momentum is much greater than that corresponding to co-rotation
The puzzling Venusian polar atmospheric structure reproduced by a general circulation model
TLDR
Numerical simulations of the Venus atmospheric circulation using a general circulation model succeed in reproducing puzzling features in close agreement with the observations, and suggest that the thermal tide is crucial for the structure of theVenus upper polar atmosphere at and above cloud levels.
Dynamics of Saturn's polar regions
We analyze data retrieved by the imaging science system onboard the Cassini spacecraft to study the horizontal velocity and vorticity fields of Saturn's polar regions (latitudes 60–90°N in
Venus’s Southern Polar Vortex Reveals Precessing Circulation
TLDR
Using high-resolution infrared measurements of polar winds from the Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, this work shows the vortex to have a constantly varying internal structure, with a center of rotation displaced from the geographic south pole by ~3 degrees of latitude and that drifts around the pole with a period of 5 to 10 Earth days.
Saturn Atmospheric Structure and Dynamics
Saturn inhabits a dynamical regime of rapidly rotating, internally heated atmospheres similar to Jupiter. Zonal winds have remained fairly steady since the time of Voyager except in the equatorial
...
...

References

SHOWING 1-10 OF 27 REFERENCES
Wave Instability in the Polar Region of Venus
  • L. Elson
  • Physics, Environmental Science
  • 1982
Infrared and radio observations of the upper cloud region of Venus indicate that the north polar region contains features of large thermal contrast. A cold collar, encompassing a region of
Polar clearing in the Venus clouds observed from the Pioneer Orbiter
PIONEER Venus 1 was put into a 24-h orbit around the planet on 4 December 1978. Since then, it has made remote sensing observations of the clouds and the overlying atmosphere at IR, visible and UV
The Nature of the Near-Infrared Features on the Venus Night Side
TLDR
Near-infrared images of the Venus night side show bright contrast features that move from east to west, in the direction of the cloud-top atmospheric superrotation, which indicates that there are partial clearings in this cloud deck.
Rotation of Venus's polar dipole
The venusian polar dipoles are long-lived, elongated, warm features seen in images of thermal emission from the polar cloud tops of the planet. They are almost 4,000 km across, are centred close to
Venus: Atmospheric Motion and Structure from Mariner 10 Pictures
TLDR
The Mariner 10 television camieras imaged the planet Venus in the visible and near ultraviolet for a period of 8 days at resolutions ranging from 100 meters to 130 kilometers, showing evidence of large-scale convection that persists in spite of the main zonal motion.
Structure of Venus's atmosphere from modelling of night-side infrared spectra
The surface and lower atmosphere of Venus lie below long path-lengths of carbon dioxide and water vapour, and thick cloud layers that were, until recently, thought to be essentially opaque to
Venus: Further Evidence of Vortex Circulation
A space-time composite of polar stereographic ultraviolet images of Venus from Mariner 10 shows a remarkable circumpolar vortex. The vortex is characterized by a cloud which appears similar to dense
Probing Venus's cloud structure with Galileo NIMS
The deep atmosphere of Venus revealed by high-resolution nightside spectra
THE night side of Venus is anomalously bright in two narrow spectral windows centred at 1.74 and 2.3 µm (ref. 1). The source of this emission has been identified recently as thermal radiation from
Temperature, Cloud Structure, and Dynamics of Venus Middle Atmosphere by Infrared Remote Sensing from Pioneer Orbiter
TLDR
One of the new discoveries is a "dipole" structure at high latitudes, with two hot spots rotating around the pole, surrounded by banks of cold cloud.
...
...