CLEARING SKIES. In June 2001, a small dust storm broke out in
the Hellas impact basin. As TES watched from orbit, the disturbance
grew until by late July it enveloped the whole planet in clouds of dust. The storm then
slowly subsided over the succeeding months. Click on the image to
download a larger version (4 MB). NASA/JPL/Arizona State University
Smith, M. D., B. J. Conrath, J. C. Pearl, and P. R. Christensen, Thermal Emission Spectrometer observations of martian planet-encircling dust storm 2001A, Icarus, 157, 259-263, 2002.