Hubble Space Telescope Imaging of Neptune's Cloud Structure in 1994

  title={Hubble Space Telescope Imaging of Neptune's Cloud Structure in 1994},
  author={Heidi B. Hammel and G. Wesley Lockwood and J. R. Mills and Christopher D. Barnet},
  pages={1740 - 1742}
Images of Neptune taken at six wavelengths with the Hubble Space Telescope in October and November 1994 revealed several atmospheric features not present at the time of the Voyager spacecraft encounter in 1989. Furthermore, the largest feature seen in 1989, the Great Dark Spot, was gone. A dark spot of comparable size had appeared in the northern hemisphere, accompanied by discrete bright features at methane-band wavelengths. At visible wavelengths, Neptune's banded structure appeared similar… 
Atmospheric Structure of Neptune in 1994, 1995, and 1996
Abstract Hubble Space Telescope imaging of Neptune in 1994, 1995, and 1996 reveals changes in atmospheric features. Dark spots at 467 nm near latitude +31° were present in both 1994 and 1995, but
Neptune's Atmospheric Circulation and Cloud Morphology: Changes Revealed by 1998 HST Imaging
Abstract On 11–12 August 1998, we imaged Neptune using the Hubble Space Telescope WFPC2 CCD camera and NICMOS InSb camera to obtain high-spatial-resolution, absolutely calibrated imagery from the
Neptune's Cloud Structure and Activity: Ground-Based Monitoring with Adaptive Optics
Abstract Since August 1995, near-infrared images of Neptune have regularly been obtained with the University-of-Hawaii telescope. These images reveal Neptune's cloud structure with an angular
The Unusual Dynamics of Northern Dark Spots on Neptune
Abstract Hubble Space Telescope (HST) and ground-based observations of Neptune from 1991 to 2000 show that Neptune's northern Great Dark Spots (NGDS) remained remarkably stable in latitude and
Uranus in 2003 : Zonal winds , banded structure , and discrete featu
Imaging of Uranus in 2003 with the Keck 10-m telescope reveals banded zonal structure and dozens of discrete cloud featur H bands; several features in the northern hemisphere are also detectable at K
Dispersion in Neptune’s zonal wind velocities from NIR Keck AO observations in July 2009
We report observations of Neptune made in H-(1.4–1.8 μm) and K’-(2.0–2.4 μm) bands on 14 and 16 July 2009 from the 10-m W.M. Keck II Telescope using the near-infrared camera NIRC2 coupled to the


Discrete cloud structure on Neptune
Neptune's Wind Speeds Obtained by Tracking Clouds in Voyager Images
Images of Neptune obtained by the narrow-angle camera of the Voyager 2 spacecraft reveal large-scale cloud features that persist for several months or longer, and wind speeds computed with respect to this radio period are roughly the same for all the planets ranging from Venus to Neptune.
Voyager 2 at Neptune: Imaging Science Results
Voyager 2 images of Neptune reveal a windy planet characterized by bright clouds of methane ice suspended in an exceptionally clear atmosphere above a lower deck of hydrogen sulfide or ammonia ices.
Dynamics of Neptune's Major Cloud Features
Abstract We used Voyager 2 images of Neptune to investigate the dynamics of the Great Dark Spot (GDS), the Scooter, the Second Dark Spot (DS2), and the South Polar Features (SPF). Relative to
Winds of Neptune - Voyager observations of cloud motions
High temporal and spatial resolution images acquired from Voyager cameras have been used to measure cloud motions to improve the meridional profile of the zonal mean circulation on Neptune. A wide
Solar cycle relationship clouded by Neptune's sustained brightness maximum
FOR almost two decades, Neptune's brightness varied inversely, at the level of a few per cent, with the solar cycle. The anticorrela-tion was so striking that some causal mechanism seemed necessary,
Voyager Planetary Radio Astronomy at Neptune
This experiment detected the foreshock of Neptune's magnetosphere and the impacts of dust at the times of ring-plane crossings and also near the time of closest approach, and found no evidence for Neptunian electrostatic discharges.
Numerical simulation of Jupiter's Great Red Spot
  • P. Marcus
  • Physics, Environmental Science
  • 1988
Jupiter's Great Red Spot is viewed as a vortex that arises naturally from the equations of motion of the jovian atmosphere. Here I solve numerically the equations governing fluid motion in a model of