NASA’s Cassini spacecraft has provided scientists the first close-up, visible-light views of a behemoth hurricane swirling around Saturn’s north pole.
In high-resolution pictures and video, scientists see the hurricane’s eye is about 1,250 miles (2,000 kilometers) wide, 20 times larger than the average hurricane eye on Earth. Thin, bright clouds at the outer edge of the hurricane are traveling 330 mph(150 meters per second). The hurricane swirls inside a large, mysterious, six-sided weather pattern known as the hexagon.
“We did a double take when we saw this vortex because it looks so much like a hurricane on Earth,” said Andrew Ingersoll, a Cassini imaging team member at the California Institute of Technology in Pasadena. “But there it is at Saturn, on a much larger scale, and it is somehow getting by on the small amounts of water vapor in Saturn’s hydrogen atmosphere.”
Scientists will be studying the hurricane to gain insight into hurricanes on Earth, which feed off warm ocean water. Although there is no body of water close to these clouds high in Saturn’s atmosphere, learning how these Saturnian storms use water vapor could tell scientists more about how terrestrial hurricanes are generated and sustained.
Both a terrestrial hurricane and Saturn’s north polar vortex have a central eye with no clouds or very low clouds. Other similar features include high clouds forming an eye wall, other high clouds spiraling around the eye, and a counter-clockwise spin in the northern hemisphere.
A major difference between the hurricanes is that the one on Saturn is much bigger than its counterparts on Earth and spins surprisingly fast. At Saturn, the wind in the eye wall blows more than four times faster than hurricane-force winds on Earth. Unlike terrestrial hurricanes, which tend to move, the Saturnian hurricane is locked onto the planet’s north pole. On Earth, hurricanes tend to drift northward because of the forces acting on the fast swirls of wind as the planet rotates. The one on Saturn does not drift and is already as far north as it can be.
“The polar hurricane has nowhere else to go, and that’s likely why it’s stuck at the pole,” said Kunio Sayanagi, a Cassini imaging team associate at Hampton University in Hampton, Va.
Scientists believe the massive storm has been churning for years. When Cassini arrived in the Saturn system in 2004, Saturn’s north pole was dark because the planet was in the middle of its north polar winter. During that time, the Cassini spacecraft’s composite infrared spectrometer and visual and infrared mapping spectrometer detected a great vortex, but a visible-light view had to wait for the passing of the equinox in August 2009. Only then did sunlight begin flooding Saturn’s northern hemisphere. The view required a change in the angle of Cassini’s orbits around Saturn so the spacecraft could see the poles.
“Such a stunning and mesmerizing view of the hurricane-like storm at the north pole is only possible because Cassini is on a sportier course, with orbits tilted to loop the spacecraft above and below Saturn’s equatorial plane,” said Scott Edgington, Cassini deputy project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, Calif. “You cannot see the polar regions very well from an equatorial orbit. Observing the planet from different vantage points reveals more about the cloud layers that cover the entirety of the planet.”
Cassini changes its orbital inclination for such an observing campaign only once every few years. Because the spacecraft uses flybys of Saturn’s moon Titan to change the angle of its orbit, the inclined trajectories require attentive oversight from navigators. The path requires careful planning years in advance and sticking very precisely to the planned itinerary to ensure enough propellant is available for the spacecraft to reach future planned orbits and encounters.
Image credit: NASA/JPL-Caltech/SSI
SPACE IS FUCKING COOL
this is so incredible
NATIONALE is one of our favorite shops in Portland — tiny and perfectly curated, abuzz with good creative energy. We’ve gladly smashed ourselves into hushed crowds washed up like surf around the perimeter of their shop to watch dance performances and listen to our friends read from their books, and we’ve happily unwrapped treasures we’ve treated ourselves to from their laden shelves. And now we’re proudly part of their star-studded line-up: they’re currently carrying our limited edition Ace x Impossible instant analog film for Polaroid cameras. To top it all off, today, NATIONALE turns three — they’re having a party at another local favorite, Holocene, with Tunnels, Wooly Mammoth Comes to Dinner and Scout Niblett, as well as DJs, a video installation by Alicia McDaid and a free advice booth from the lovely Jenn Armbrust. Everything’s going down 8:30 til late for a paltry six bucks — see the full schedule here.
Wooly Mammoth pictured here dancing on the tables at Clyde Common.
Soup Dragons - “I’m Free” (by letgr00ve)
LOVE YOU MAY. LOVE YOU NATIONALE.
Actually, I’d like to express that Adam Forkner/WHITE RAINBOW deserves one since I believe he’s a Dr. of PIZZA. Man, just reblogging this post is making me hungry for some PIZZA. If I wore that shirt, would I be hungry for PIZZA all the time? Or would it finally satiate the PIZZA hunger. Anyway, my vote is for you to give a free PIZZA shirt to Adam. Thanks, Kathleen Keogh (PIZZA)
KEEP EM COMIN’
Want a FREE PIZZA SHIRT ? Reblog this + tell us why you think you deserve one, the best answer by 1/20/12 will win a free shirt
WOOLLY MAMMOTH has applied to Portland Stock. YOU can vote for us to get the grant we have applied for, funding to continue to create our next evening length piece.
It is a DINNER PARTY:
PNCA on Sunday, Nov 6th at 6:00 pm
The price of dinner and a vote is $10 ($5 to just vote with no dinner!)
OR volunteer and vote and eat for FREE!
RSVP to at firstname.lastname@example.org
(photo: Karley Sullivan)
At PLACE! A gallery space on the third floor of the Pioneer Place Mall (Atrium Bldg) in downtown Portland, OR
October 26th Wednesday
7pm - 830pm
Woolly Mammoth, Nietzsche, and Michael Jackson Come to Dinner
Gina Altamura - philosopher
Woolly Mammoth Comes to Dinner - artists
7pm - 830pm
Gina Altamura is this month’s philosopher
Woolly Mammoth Comes to Dinner is this month’s artist
Steve Roach - Structures From Silence (excerpt)