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Related Experiment Videos

Uranus: microwave images.

W J Jaffe1, G L Berge, T Owen

  • 1Space Telescope Science Institute, Baltimore, Maryland 21218, USA.

Science (New York, N.Y.)
|August 10, 1984
PubMed
Summary
This summary is machine-generated.

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New Uranus observations reveal reversed temperature trends, suggesting atmospheric changes. These findings impact our understanding of planetary atmospheres and temperature variations.

Area of Science:

  • Planetary Science
  • Radio Astronomy

Background:

  • Uranus exhibits complex atmospheric dynamics and temperature variations.
  • Previous studies indicated a secular increase in Uranus's temperature over 15 years.

Purpose of the Study:

  • To map Uranus's brightness temperature at 2 and 6 centimeters.
  • To investigate recent temperature trends and atmospheric variations on Uranus.

Main Methods:

  • Utilized the Very Large Array (VLA) for radio observations in 1980 and 1981.
  • Generated brightness temperature maps at 2 cm and 6 cm wavelengths.

Main Results:

  • Observed subsolar symmetry at 2 cm and near-polar symmetry at 6 cm.
  • Detected a temperature increase from equator to pole at 6 cm, with a potential warm polar ring.

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  • Measured disk-average temperatures (147 ± 5 K at 2 cm, 230 ± 6 K at 6 cm) lower than previously reported.

    • Conclusions:

    • The observed temperatures suggest a reversal of the previously reported secular temperature increase.
    • Variations in brightness temperature likely indicate changes in atmospheric ammonia abundance.
    • The underlying mechanism driving these atmospheric variations remains undetermined.