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

@article{Hammel1995HubbleST,
  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},
  journal={Science},
  year={1995},
  volume={268},
  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… Expand

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References

SHOWING 1-10 OF 23 REFERENCES
Discrete cloud structure on Neptune
Discrete cloud structure on Neptune is discussed, emphasizing information derived from recent CCD imaging. At methane-band wavelengths, discrete cloud features were obvious in the southernExpand
Neptune's Wind Speeds Obtained by Tracking Clouds in Voyager Images
TLDR
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. Expand
An atmospheric outburst on Neptune from 1986 through 1989
Abstract In two independent long-term programs (visual photometry and methane-band imaging), we find that Neptune underwent a period of unusual atmospheric activity from 1986 through 1989. ThisExpand
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.Expand
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 toExpand
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 wideExpand
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,Expand
Vertical aerosol structure of Neptune: Constraints from center-to-limb profiles
Abstract We present and analyze center-to-limb (CTL) profiles of the equatorial region of Neptune, extracted from images with good spatial resolution. Models of the quiescent atmosphere of NeptuneExpand
Voyager Planetary Radio Astronomy at Neptune
TLDR
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. Expand
Numerical simulation of Jupiter's Great Red Spot
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 ofExpand
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3
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