We just published a paper in Geophysical Research Letters (GRL) on the first lidar observations of regular occurrence of mid-latitude thermosphere-ionosphere Na (TINa) layers over Boulder. https://doi.org/10.1029/2021GL093729 This is the first time that metal layers are regularly seen at these extreme altitudes in the atmosphere. Just 10 years ago, Chu’s team discovered such high-altitude metal… Read More