Voyager 1 Jupiter Images – Southern oval

Voyager 1 obtained this mosaic of a southern oval about 12 hours before closest appoach to Jupiter. In addition, two color frames obtained almost one hour earlier were used for the rightmost part of the image to get complete coverage of the easternmost part of the reddish oval that is conspicuous in this mosaic. The oval is located near latitude 60°S and is about 5000 km across. Like the Great Red Spot it is anticyclonic. Farther south the south polar hood/haze is obvious. Its northern edge is usually near 66°S. It is bluish in the enhanced image here, both due to the stronger blue color (relative to red/green) in the polar hood and also because of Rayleigh scattering near the limb. Observations have shown that the top of the main cloud layer is lower in the polar regions than elsewhere. When Voyager 1 obtained these images it was less than 1 degree south of Jupiter's equatorial plane while the oval is located near latitude 60°S. This makes the oval highly foreshortened; in reality it is much closer to a circular shape than the images suggest. The images used in the mosaic were obtained on March 4, 1979 when Voyager 1 was about 930,000 km from Jupiter's center.