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Dust storm. A dust storm (or sandstorm in some contexts) is a meteorological phenomenon. Such a storm is usually the result of convection currents created by intense heating of the ground. Note: The above text is excerpted from the Wikipedia article Dust storm, which has been released under the GNU Free Documentation License.
The Martian north polar cap is another region of dust storms. Observations of the Sun using the camera on Mars Pathfinder showed more dust in the Martian atmosphere than was expected. In fact, the amount of dust was comparable to Viking observations during clear (non-dust-storm) times.