. 24/7 Space News .
Martians Will Need To Watch Out For Towering Electrified Dust Devils

An artist's concept of a Martian dust devil.
by Trudy E. Bell for NASA Science News
Huntsville AL (SPX) Jul 15, 2005
Ah, Martian summer! Finally, the days are long, just like on dear old Earth. And daytime highs rocket all the way up to a balmy 20�C (68�F) from the summer nighttime low of -90�C (-130�F), meaning you and your fellow astronauts can warm up your machinery earlier to get a good start on mining operations.

But those warm daytime temperatures also bring alive the Martian devils. Dust devils, that is.

You were caught in one just yesterday - and a devilishly terrifying experience it was. This was no little Arizona desert whirlwind, only a few tens of meters high and a few meters across and past you in seconds.

No, what hit you yesterday was a monster column towering kilometers high and hundreds of meters wide, 10 times larger than any tornado on Earth. Red-brown sand and dust whipping around faster than 30 meters per second (70 miles per hour) dropped visibility to zero, scouring your faceplate, driving dust into every fold and wrinkle of your spacesuit.

For 15 minutes you huddled and endured the buffeting. The scariest part was the incessant crackling and flashing of miniature lightning bolts nipping at you and your rover, and the loud static on your radio that prevented you from calling for help.

Could this really happen? According to NASA's Vision for Space Exploration, astronauts are going to visit Mars in the decades ahead. And when they get there, dust devils will be waiting.

"The sand in the lower part of a Martian dust devil would be the biggest hazard," says Mark T. Lemmon, associate research scientist in the Department of Atmospheric Sciences at Texas A & M University.

"The atmospheric pressure on Mars is only 1 percent that at sea level [on Earth], so you wouldn't feel much wind against you. But you'd still be pinged by high-speed material."

Moreover, the moving dust and sand may become electrically charged, to the point of "arcing to your spacesuit or vehicle, and creating electromagnetic interference," adds William M. Farrell of NASA's Goddard Space Flight Center.

Dust devils on Mars form the same way they do in deserts on Earth. "You need strong surface heating, so the ground can get hotter than the air above it," explains Lemmon.

Heated less-dense air close to the ground rises, punching through the layer of cooler denser air above; rising plumes of hot air and falling plumes of cool air begin circulating vertically in convection cells.

Now, if a horizontal gust of wind blows through, "it turns the convection cells on their sides, so they begin spinning horizontally, forming vertical columns--and starting a dust devil."

Hot air rising through the center of the column powers the whirling air ever faster--fast enough to begin picking up sand. Sand scouring the ground then dislodges flour-fine dust, and the central column of hot rising air buoys that dust high aloft. Once prevailing horizontal winds begin pushing the dust devil across the ground, look out!

"If you were standing next to the Spirit rover right now [in Gusev Crater] in the middle of the day, you might see half a dozen dust devils," says Lemmon.

Each Martian spring or summer day, dust devils begin appearing about 10 AM as the ground heats, and start abating about 3 PM as the ground cools (Mars's solar day of 24 hours 39 minutes is only 39 minutes longer than Earth's).

Although the exact frequency and duration of Martian dust devils is unknown, photographs from Mars Global Surveyor in orbit reveal innumerable wandering tracks at all latitudes on the planet.

These tracks crisscross the surface where dust devils have scoured away loose surface material to reveal different-colored soil beneath.

Moreover, actual dust devils have been photographed from orbit--some of them as large as 1 to 2 kilometers across at their base and (from their shadows) clearly towering 8 to 10 km high.

What intrigues Farrell from having chased dust devils in the Arizona desert, however, is the strange fact that terrestrial dust devils are electrically charged--and Martian dust devils might be, too.

Dust devils get their charge from grains of sand and dust rubbing together in the whirlwind. When certain pairs of unlike materials rub together, one material gives up some of its electrons (negative charges) to the other material. Such separation of electric charges is called triboelectric charging, the prefix "tribo" (pronounced TRY-bo) meaning "rubbing."

Triboelectric charging makes your hair stand on end when you rub a balloon against your head. Dust and sand, like plastic and hair, form a tribolelectric pair. (Dust and sand aren't necessarily made of the same stuff, notes Lemmon, because "dust can be blown in from anywhere.") Smaller dust particles tend to charge negative, taking away electrons from the larger sand grains.

Because the rising central column of hot air that powers the dust devil carries the negatively-charged dust upward and leaves the heavier positively-charged sand swirling near the base, the charges get separated, creating an electric field.

"On Earth, with instruments we've measured electric fields on the order of 20 thousand volts per meter (20 kV/m)," Farrell says. That's peanuts compared to the electric fields in terrestrial thunderstorms, where lightning doesn't flash until electric fields get 100 times greater--enough to ionize (break apart) air molecules.

But a mere 20 kV/m "is very close to the breakdown of the thin Martian atmosphere," Farrell points out. More significantly, Martian dust devils are so much bigger than their terrestrial counterparts that their stored electrical energy may be much higher. "How would those fields discharge?" he asks.

"Would you have Martian lightning inside the dust devils?" Even if lightning wouldn't ordinarily occur naturally, the presence of an astronaut or rover or habitat might induce filamentary discharges, or local arcing. "The thing you'd really have to watch out for is corners, where electric fields can get very strong," he adds. "You might want to make your vehicle or habitat rounded."

Another consideration for astronauts on Mars would be "radio static as charged grains hit bare-wire antennas," Farrell warns.

And after the dust devil passed over and was gone, a lasting souvenir of its passage would be an increased adhesion of dust to spacesuits, vehicles, and habitats via electrostatic cling--the same phenomenon that causes socks to stick together when pulled out of a clothes dryer--making cleanup difficult before reentering a habitat.

Because Martian dust devils can tower 8 to 10 kilometers high, planetary meteorologists now think the devils may be responsible for throwing so much dust high into the Martian atmosphere. Importantly for astronauts, that dust may be carrying negative charges high into the atmosphere as well.

Charge building up at the storm top could pose a hazard to a rocket taking off from Mars, as happened to Apollo 12 in November 1969 when it lifted off from Florida during a thunderstorm: the rocket exhaust ionized or broke down the air molecules, leaving a trail of charged molecules all the way down to the ground, triggering a lightning bolt that struck the spacecraft.

"Early sea navigators, like Columbus, understood that their ships had to be designed for extreme weather conditions," Farrell points out. "To design a mission to Mars, we need to know the extremes of Martian weather--and those extremes appear to be in the form of dust storms and devils."

Related Links
Mars Rovers at JPL
Mars Rovers at Cornell
SpaceDaily
Search SpaceDaily
Subscribe To SpaceDaily Express

Mars Has An Aurora, And It's Like None Other In The Solar System
London, UK (ESA) Jun 09, 2005
Mars Express was flying 270 kilometers (168 miles) above the planet when SPICAM's field of view was positioned just above the limb, or edge, of the planet during the Aug. 11, 2004 orbit.



Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only














The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.