by K.E. Chilton
This was written to augment a talk by Robert G. Speck to the Discussion Group of the Hamilton Centre of the Royal Astronomical Society of Canada on April 22, 1976.
Three main cloud types have been distinguished in the thin, dry, cold Martian atmosphere: white, blue and yellow clouds, so named for the colours which they predominantly reflect.
White clouds vary considerably in thickness, brilliance and extent. They can be subdivided into three categories: