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In reviewing data for the past fifteen years have scientists have identified an unexpected cold region in Jupiter’s upper mid-latitudes as large as the Great Red Spot.
“The Great Cold Spot is much more volatile than the slowly changing Great Red Spot, changing dramatically in shape and size over only a few days and weeks, but it has re-appeared for as long as we have data to search for it, for over 15 years,” Stallard said. “That suggests that it continually reforms itself, and as a result it might be as old as the aurorae that form it – perhaps many thousands of years old.”
The Great Cold Spot is thought to be caused by the effects of the magnetic field of the planet, with the massive planet’s spectacular polar aurorae driving energy into the atmosphere in the form of heat flowing around the planet.
Though they think the cold region is related to the aurora, I suspect they really do not have enough information to really understand what is going on.