Sunday, November 2, 2008

Violent Polar Cyclones on Saturn Imaged in Unprecedented Detail by Cassini

The Cassini mission has released some of the most detailed images of Saturn's poles yet, revealing vast cyclones churning up the gas giant's atmosphere in the north and south. These observations show very similar storms to the south pole observations imaged by the NASA spacecraft in 2006, only in far better detail. It is believed the north and south cyclones are generated by violent thunderstorms deep inside Saturn's atmosphere; water condensing inside these storms output heat, fuelling the vortex extending 2,500 miles (4,000 kilometres) in diameter. The smallest features resolved are 120 kilometre (75 mile)-wide cumulus clouds rotating at velocities in excess of 325 mph (530 kph), more than twice the wind speed possible on Earth

and the mystery north pole hexagon is still there.

Cassini has wowed scientists with these brand new views of Saturn's north pole. With detail at 10-times higher resolution than previously attained, Cassini has shown that both poles have vast swirling cyclones that highlight regions of planet-wide storm activity.

"These are truly massive cyclones, hundreds of times stronger than the most giant hurricanes on Earth," said Kevin Baines, Cassini scientist on the visual and infrared mapping spectrometer at NASA's Jet Propulsion Laboratory. "Dozens of puffy, convectively formed cumulus clouds swirl around both poles, betraying the presence of giant thunderstorms lurking beneath. Thunderstorms are the likely engine for these giant weather systems."

Interestingly, the northern storm observation still shows the mysterious hexagonal shape (as originally verified in 2006, after a sighting by Voyager 1 in 1980), only in far greater detail. Scientists are still uncertain why the northern cyclone should take such a stable form; the clouds within the hexagonal shape spin at high speeds without interfering with its six-sided shape.

Previous observations appeared to show an outer ring of high clouds surrounding a region thought to be clear air with a few puffy clouds circulating around the pole. These brand new images reveal a far more complex picture. The circulating clouds are actually smaller convective storms forming other, more distinct rings.

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