EYE IN THE SKY. For three Mars years, TES tracked the weather on Mars, following the planet through its yearly cycle. Mars dates are based on the Sun's longitude (Ls, seen at bottom); northern hemisphere spring begins at Ls = 0. Click on the image to download a larger version. NASA/JPL/Arizona State University
References:
Smith, M. D., Interannual variability in TES atmospheric observations of Mars during 1999-2003, Icarus, 167, 148-165, 2004.