A set of images of the Venus south polar vortex at 3.8 microns acquired by VIRTIS. The images show the temperature of the clouds top at about 40 miles (65 kilometers) altitude. A darker region corresponds to higher temperature and thus lower altitude. The center of the vortex, approximately at a temperature of about -10 Fahrenheit (-23 Celsius), is the deepest zone, exhibiting the highest temperature of the Venus clouds' top.
ESA/VIRTIS/INAF-IASF/Obs. de Paris-LESIA