The Po Valley Air Orchestra: How Global Rhythms Conduct Temperatures Up to 20 Kilometers
Twice a day, at eleven in the morning and eleven at night, a white balloon with an instrument rises into the sky from a tiny station in San Pietro Capofiume, just eleven meters above sea level. Over twenty-two years, more than sixteen thousand such launches have recorded how air temperature changes with altitude: from the warm ground to the thin cold at twenty kilometers.