Tuesday, March 16, 2010

Jupiter's Great Red Spot

We're starting to understand it a little more, as Space.com reports.

New images have revealed an unprecedented look at the swirling winds inside Jupiter's famed Great Red Spot and allowed scientists to build the first-ever detailed weather map of the giant storm's insides.

"This is our first detailed look inside the biggest storm of the solar system," said Glenn Orton of NASA's Jet Propulsion Laboratory in Pasadena, Calif., and the leader of the team that studied Jupiter's giant spot.

Orton and his team looked at thermal images of the Great Red Spot taken with the European Southern Observatory's Very Large Telescope (VLT) in Chile. The images revealed that the reddest colour of the Great Red Spot corresponds to a warm core within the otherwise cold storm system, and images show dark lanes at the edge of the storm where gases are descending into the deeper regions of the planet.


"We once thought the Great Red Spot was a plain old oval without much structure, but these new results show that it is, in fact, extremely complicated," Orton said.

Jupiter's Great Red Spot is at least hundreds of years old and has been observed by astronomers on Earth since the 19th century. The storm is massive, and is large enough to fit three entire Earths inside.


"One of the most intriguing findings shows the most intense orange-red central part of the spot is about 3 to 4 degrees warmer than the environment around it," said team member Leigh Fletcher of the University of Oxford in England.

This temperature difference might not seem like a lot, but it is enough to allow the storm circulation, usually counter-clockwise, to shift to a weak clockwise circulation in the very middle of the storm. Not only that, but on other parts of Jupiter, the temperature change is enough to alter wind velocities and affect cloud patterns in the belts and zones.

"This is the first time we can say that there's an intimate link between environmental conditions — temperature, winds, pressure and composition — and the actual color of the Great Red Spot," Fletcher said. "Although we can speculate, we still don't know for sure which chemicals or processes are causing that deep red color, but we do know now that it is related to changes in the environmental conditions right in the heart of the storm."

Image courtesy of ESO/NASA/JPL/ESA/L. Fletcher

Sorry about the lengthy block quote, but this kind of thing fascinates me. A giant storm, bigger than three Earths, stable for hundreds of years despite its tempestuous nature. What's not to like?

I just had to share.

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