• DOI:10.1126/science.274.5286.389
• Corpus ID: 128624870

Galileo Photopolarimeter-Radiometer Observations of Jupiter and the Galilean Satellites

@article{Orton1996GalileoPO,
  title={Galileo Photopolarimeter-Radiometer Observations of Jupiter and the Galilean Satellites},
  author={Glenn S. Orton and John R. Spencer and Lisa deMena Travis and Terry Z. Martin and Leslie K. Tamppari},
  journal={Science},
  year={1996},
  volume={274},
  pages={389 - 391}
}

• G. Orton, J. Spencer, +2 authors L. Tamppari
• Published 18 October 1996
• Physics, Environmental Science
• Science

Photopolarimeter-Radiometer (PPR) maps of daytime temperatures on Ganymede at a resolution of 220 kilometers show the expected anticorrelation with albedo, but morning temperatures were about 10 kelvin warmer than expected. Europa had a subsolar temperature of 128 kelvin and a lower effective thermal inertia than either Ganymede or Callisto, and Io's night side was cooler than predicted by recent models, perhaps requiring revision of heat-flow estimates. The lowest 250-millibar temperatures in the Great Red Spot (GRS) generally corresponded to the visually darkest regions. Temperatures remained cold north of the GRS, but they rose by as much as 6 kelvin to the south over the 2800-kilometer PPR resolution. A visually bright region northwest of the GRS was also relatively cold. It is likely that NH3 clouds affected the determination of the 500-millibar temperature field, which appears qualitatively different.