Mars - thermal radiation spectra

This figure shows the thermal radiation spectra measured during the global dust storm during Mars Express orbit 4479 (represented by the black curve), and during the final phase of a small dust storm (shown by the blue curve), measured during orbit 71. The data is shown as thermal brightness, in degrees Kelvin.

During the global dust storm, the upper atmosphere is warmer than usual (spectral region A), while the temperature close to the soil is colder than usual ( spectral region B).