Noctilucent clouds
AUG 01, 1964
DOI: 10.1063/1.3051762
According to an agreement announced on June 5, the National Aeronautics and Space Administration and the Swedish Space Committee will extend for another year cooperative sounding‐rocket studies of the upper atmosphere and of the faintly luminous noctilucent clouds which are usually visible only during summer twilight in the auroral regions.
© 1964. American Institute of Physics
