sexta-feira, 13 de julho de 2012
* When Wildfire Smoke and Thunderstorms Collide
* Elusive Sprite Captured from the International Space Station
* Al Jubayl, Saudi Arabia at Night
* Sea Ice Retreat in the Beaufort Sea
* Kalimantan, Borneo, Indonesia
* Waldo Canyon Fire Burn Scar
* Growth in Washington, District of Columbia
* Power Outages in Washington, DC Area
Recent Blog Posts:
* EO's Satellite Puzzler: Entry Number 2
* A Unique View of Wildfire Smoke
Notes from the Field
* Siberia 2012 - Embenchime River Expedition: Introduction
* Siberia 2012: Embenchime River Expedition - Biographies
* Notes from the Field - Week 4
News release: 2012-202 July 11, 2012
- end -
News release: 2012-201b July 11, 2012
- end -
News release: 2012-200 July 10, 2012
PASADENA, Calif. – Images from NASA's Cassini spacecraft show a concentration of high-altitude haze and a vortex materializing at the south pole of Saturn's moon Titan, signs that the seasons are turning on Saturn's largest moon.
"The structure inside the vortex is reminiscent of the open cellular convection that is often seen over Earth's oceans," said Tony Del Genio, a Cassini team member at NASA's Goddard Institute for Space Studies, N.Y. "But unlike on Earth, where such layers are just above the surface, this one is at very high altitude, maybe a response of Titan's stratosphere to seasonal cooling as southern winter approaches. But so soon in the game, we're not sure."
Cassini first saw a "hood" of high-altitude haze and a vortex, which is a mass of swirling gas around the pole in the moon's atmosphere, at Titan's north pole when the spacecraft first arrived in the Saturn system in 2004. At the time, it was northern winter. Multiple instruments have been keeping an eye on the Titan atmosphere above the south pole for signs of the coming southern winter.
While the northern hood has remained, the circulation in the upper atmosphere has been moving from the illuminated north pole to the cooling south pole. This movement appears to be causing downwellings over the south pole and the formation of high-altitude haze and a vortex.
Cassini's visible light cameras saw the first signs of hazes starting to concentrate over Titan's south pole in March, and the spacecraft's visual and infrared mapping spectrometer (VIMS) obtained false-color images on May 22 and June 7.
"VIMS has seen a concentration of aerosols forming about 200 miles [300 kilometers] above the surface of Titan's south pole," said Christophe Sotin, a VIMS team member at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "We've never seen aerosols here at this level before, so we know this is something new."
During a June 27 distant flyby, Cassini's imaging cameras captured a crow's-eye view of the south polar vortex in visible light. These new images show this detached, high-altitude haze layer in stunning new detail.
"Future observations of this feature will provide good tests of dynamical models of the Titan circulation, chemistry, cloud and aerosol processes in the upper atmosphere," said Bob West, deputy imaging team lead at JPL.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, 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.
The new images are available online at: http://www.nasa.gov/mission_pages/cassini/whycassini/cassini20120710.html
Joe Mason 720-974-5859
- end -
De acuerdo con datos proporcionados por el Orbitador de Reconocimiento Lunar es posible que un porcentaje de la superficie del cráter Shackleton, en la Luna, albergue hielo.
TODO EL REPORTAJE en http://ciencia.nasa.gov/ciencias-especiales/21jun_shackleton/
Este es un servicio gratuito.
Observatório Astronômico Monoceros
Planetário Além Paraíba
Estação Meteorológica 083/MG-5ºDISME-INMET
Sites e Blogs principais:
EARTH-DIRECTED X-FLARE: Big sunspot AR1520 erupted on July 12th around 16:53
UT, producing an X-class solar flare and hurling a CME directly toward
Earth. Forecasters expect the cloud to arrive on July 14th. Its impact
could spark moderate to severe geomagnetic storms, allowing auroras to be
seen at lower latitudes than usual. Check http://spaceweather.com for more
information and updates.
AURORA ALERTS: Would you like a call when geomagnetic storms are underway?
Aurora alerts are available from http://spaceweathertext.com (text) and
You are subscribed to the Space Weather mailing list, a free service of
New subscribers may sign up for free space weather alerts at