The high resolution stereo camera on board the European Space Agency’s Mars Express orbiter captured this impressive upwelling front of dust clouds – visible in the right half of the frame – near the north polar ice cap of Mars in April.
It was one of several local small-scale dust storms that have been observed in recent months on the Red Planet, which is currently enduring a particularly intense dust storm season. A much larger storm emerged further southwest at the end of May and developed into a global, planet-encircling dust storm within several weeks.
The intensity of this major event means very little light from the Sun reaches the martian surface, a situation extreme enough that NASA’s 15-year old Opportunity rover has been unable to recharge its batteries and call home: it has been in hibernation mode since mid-June.
Dust storms on Mars occur regularly during the southern summer season when the planet is closer to the Sun along its elliptical orbit. The enhanced solar illumination causes stronger temperature contrasts, with the resulting air movements more readily lifting dust particles from the surface – some of which measure up to about 0.01 mm in size.
Martian dust storms are very impressive, both visually like in this image and in terms of the intensity and duration of the rarer global events, but they are generally weaker compared to hurricanes on Earth. Mars has a much lower atmospheric pressure – less than one hundredth of Earth’s atmospheric pressure at the surface – and Martian storms have less than half the typical wind speeds of hurricanes on Earth.
The current storm is being monitored by five ESA and NASA orbiters, while NASA’s Curiosity rover has been observing it from the ground thanks to its nuclear-powered battery. Understanding more about how global storms form and evolve will be critical for future solar-powered missions to Mars.
This colour image was created using data from the nadir channel, the field of view of which is aligned perpendicular to the surface of Mars, and the colour channels of the high-resolution stereo camera. The ground resolution is approximately 16 m/pixel and the images are centred at about 78°N/106°E.
Originally published by Cosmos as A Martian dust storm
Curated content from the editorial staff at Cosmos Magazine.
Read science facts, not fiction...
There’s never been a more important time to explain the facts, cherish evidence-based knowledge and to showcase the latest scientific, technological and engineering breakthroughs. Cosmos is published by The Royal Institution of Australia, a charity dedicated to connecting people with the world of science. Financial contributions, however big or small, help us provide access to trusted science information at a time when the world needs it most. Please support us by making a donation or purchasing a subscription today.