Wave clouds form in a stable stratified atmosphere when winds pass over topographic features such as crater rims. North is to the upper right. The air is quite dusty in the picture, which was taken in red light soon after the onset of the second global dust storm. North is to the right of the image. This view shows waves west of Argyre which are associated with a weather system which also produced the Argyre dust storm.
North is to the bottom of the image.