NASA monitors massive dust storm on Mars
- From: AAP
- November 27, 2012
THE US space agency says it is monitoring a massive dust storm on Mars that has produced atmospheric changes.
It's the first time since the 1970s Viking Missions that NASA is studying such a phenomenon both from orbit and with a weather station on the surface, NASA said on its website.
"This is now a regional dust storm," said Rich Zurek, chief Mars scientist at NASA's Jet Propulsion Laboratory in Pasadena, California. "It has covered a fairly extensive region with its dust haze, and it is in a part of the planet where some regional storms in the past have grown into global dust hazes."
"One thing we want to learn is why do some Martian dust storms get to this size and stop growing, while others this size keep growing and go global," said Zurek.
As of November 16, the Mars Reconnaissance Orbiter detected a warming of the atmosphere about 25 kilometers above the storm. Since then, the region's atmosphere has increased by about 25 degrees Celsius.
The phenomenon is due to dust -- being lofted above the surface -- absorbing sunlight at that height, according to NASA.
Warmer temperatures have also been detected in a "hot spot" near northern polar latitudes due to changes in atmospheric circulation.
The storm, which came no closer than about 840 miles to NASA's Opportunity robot, on Mars since 2004, resulting in a "slight drop in atmospheric clarity over the rover," NASA said.
NASA's Mars rover Curiosity, which arrived on Mars on August 6 and is powered by a radioisotope thermoelectric generator rather than solar cells, is likely to be less affected by the storm.
Curiosity's weather station -- located halfway around the planet from Opportunity -- detected atmospheric changes tied to the storm, with sensors measuring a decrease in air pressure and a slight rise in overnight low temperature.
Curiosity is on a two-year, $2.5 billion mission to investigate whether it is possible to live on Mars and to learn whether conditions there might have been able to support life in the past.
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