Abstract
The complex index of refraction of the Martian dust particles suspended in the atmosphere is estimated. Using this parameter, we solve the multiple scattering equations and investigate quantitatively heating of the Martian atmosphere due to absorption of the visible solar radiation. Our results show that the atmosphere is strongly heated up by absorption of solar radiation due to dust, and that the thermal structure of the Martian atmosphere would be almost determined by the balance between heating and cooling caused by radiative effects of dust. It is also pointed out that the thermal effects due to dust would induce strong thermal tide. Analyses of the Mariner 9 data indicate fairly good agreement with our results. A new general circulation model for Mars including the thermal effects of dust should be required at the moment.
