The more correct view seems to be that the loss of heat by radiation is increased so much through the rarity of the air above it as to more than counterbalance the increased insolation, so that though the surface of the earth at a given altitude may receive 10 per cent.
"Is Mars Habitable?"
Alfred Russel Wallace
This law is, that reduced atmospheric pressure increases radiation, or loss of heat, more rapidly than it increases insolation or gain of heat, so that the result is always a considerable lowering of temperature.
"Is Mars Habitable?"
Alfred Russel Wallace
152. This Appellation is applied to those Disorders, which arise from too violent an Influence of the Heat of the Sun, immediately upon the Head; and which in one Word may be termed insolation.
"Advice to the people in general, with regard to their health"
Samuel Auguste David Tissot