Huge Burp At Saturn After Large Storm
Goddard scientists describe the unprecedented belch of energy in a paper to be published in the Nov. 20 issue of the Astrophysical Journal.
The 150 F jump in Saturn’s stratosphere during the 2010 Great White Spot storm has set a new record for the largest atmospheric temperature change ever detected during a storm on the ringed planet.
“This temperature spike is so extreme it’s almost unbelievable, especially in this part of Saturn’s atmosphere, which typically is very stable,” said Brigette Hesman, the study’s lead author and a University of Maryland scientist who works at Goddard. “To get a temperature change of the same scale on Earth, you’d be going from the depths of winter in Fairbanks, Alaska, to the height of summer in the Mojave Desert.”
First detected by Cassini in Saturn’s northern hemisphere on Dec. 5, 2010, the storm grew so large that an equivalent storm on Earth would blanket most of North America from north to south and wrap around our planet many times. This type of giant disturbance on Saturn typically occurs every 30 Earth years, or once every Saturn year.
Not only was this the first storm of its kind to be studied by a spacecraft in orbit around the planet, but it was the first to be observed at thermal infrared wavelengths. Infrared data from CIRS allowed scientists to take the temperature of Saturn’s atmosphere and to track phenomena that are invisible to the naked eye.
These red, orange and green clouds (false color) in Saturn’s northern hemisphere indicate the tail end of the massive 2010-2011 storm. Even after visible signs of the storm started to fade, infrared measurements continued to reveal powerful effects at work in Saturn’s stratosphere.
Credit: NASA/JPL-Caltech/Space Science Institute
› Larger image (TIF)
Temperature measurements by CIRS, first published in May 2011, revealed two unusual beacons of warmer-than-normal air shining brightly in the stratosphere. These indicated a massive release of energy into the atmosphere. After the visible signs of the storm started to fade, CIRS data revealed the two beacons had merged. The temperature of this combined air mass shot up to more than minus 64 degrees Fahrenheit (above 220 kelvins).
According to Hesman, the huge spike of ethylene generated at the same time peaked with 100 times more ethylene than scientists thought possible for Saturn. Goddard scientists confirmed the release of the gas using the Celeste spectrometer mounted on the McMath-Pierce Solar Telescope on Kitt Peak in Arizona.
The forceful storm generated unprecedented spikes in temperature and increased amounts of ethylene. In these two sets of measurements taken by Cassini’s composite infrared spectrometer, yellow represents the highest temperatures. Each strip maps a single molecule (top: methane; bottom: ethylene), with temperature measurements taken in the northern hemisphere, all the way around the planet.
Credit: NASA/JPL-Caltech/Goddard › Larger image
The team still is exploring the origin of the ethylene, but has ruled out a large reservoir deep in the atmosphere.
“We’ve really never been able to see ethylene on Saturn before, so this was a complete surprise,” said Goddard’s Michael Flasar, the CIRS team lead.
A complementary paper led by Cassini team associate Leigh Fletcher of Oxford University, England, describes how the two stratospheric beacons merged to become the largest and hottest stratospheric vortex ever detected in our solar system. Initially, it was larger than Jupiter’s Great Red Spot.
Their paper in the journal Icarus, which combines CIRS data with additional infrared images from other Earth-based telescopes, including NASA’s Infrared Telescope Facility at Mauna Kea, Hawaii, also reports a powerful collar of clockwise winds — encompassing a bizarre soup of gases — around the vortex.
“These studies will give us new insight into some of the photochemical processes at work in the stratospheres of Saturn, other giants in our solar system, and beyond,” said Scott Edgington, Cassini deputy project scientist at NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, Calif.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency, and the Italian Space Agency. The mission is managed by JPL for NASA’s Science Mission Directorate in Washington. Hesman’s work was funded in part by NASA’s Planetary Astronomy Program in Washington. The CIRS instrument and Celeste spectrometer were built at Goddard.
Related Links
› Read more about the Fletcher paper
› NASA’s Cassini website
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