Ballonsonde (IMAGE) NOAA Headquarters Caption NOAA researchers at the South Pole release a ballonsonde, a massive balloon carrying instruments that measure ozone, temperature, humidity and more from the surface of the snow to about 20 miles high. Credit NOAA photo by Christy Schultz Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.