mercredi 28 novembre 2012

Swirling Storms on Saturn












NASA / ESA - Cassini "Insider's" logo.

Nov.28, 2012

 Peering into the Storm

Image above: This image from NASA's Cassini mission was taken on Nov. 27, 2012, with Cassini's narrow-angle camera. Image credit: NASA/JPL-Caltech/Space Science Institute.

NASA's Cassini spacecraft has been traveling the Saturnian system in a set of inclined, or tilted, orbits that give mission scientists a vertigo-inducing view of Saturn's polar regions. This perspective has yielded images of roiling storm clouds and a swirling vortex at the center of Saturn's famed north polar hexagon.

Saturn's North Pole, Wide View

Image above: The camera was pointing toward Saturn from approximately 233,742 miles (376,171 kilometers) away. Image credit: NASA/JPL-Caltech/Space Science Institute.

These phenomena mimic what Cassini found at Saturn's south pole a number of years ago. Cassini has also seen storms circling Saturn's north pole in the past, but only in infrared wavelengths because the north pole was in darkness. (See http://www.jpl.nasa.gov/news/news.php?release=2008-192 .) But, with the change of the Saturnian seasons, the sun has begun to creep over the planet's north pole.

Vortex at Saturn's North Pole

Image above: The camera was pointing toward Saturn from approximately 248,578 miles (400,048 kilometers) away. Image credit: NASA/JPL-Caltech/Space Science Institute.

This particular set of raw, unprocessed images was taken on Nov. 27, 2012, from a distance of about 250,000 miles (400,000 kilometers) from Saturn.

Cassini spacraft. Image credit: NASA/JPL-Caltech

More raw images are available at http://saturn.jpl.nasa.gov/photos/raw/index.cfm . The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team is based at the Space Science Institute in Boulder, Colo.

ESA Cassini-Huygens website: At Saturn and Titan: http://www.esa.int/SPECIALS/Cassini-Huygens/index.html

Images (mentioned), Text, Credits: NASA / ESA / JPL / Jia-Rui Cook / Space Science Institute / Steve Mullins.

Best regards, Orbiter.ch