Low-Latitude Noctilucent Cloud of 15 June 1963.
A bright noctilucent cloud was observed and photographed north-west of Tucson on 15 June 1963. Results of computations indicate that the cloud was at a height of 71 kilometers. The cloud appears to have resulted from the launching of a Scout space vehicle.
Meinel
A B
AB
Middlehurst
B
B
Whitaker
E
E