title: Temperature measurements in noctilucent clouds.
abstract: Results of ten rocket soundings conducted from Kronogard, Sweden, and Barrow, Alaska, during the summers of 1963 through 1965 indicate that a temperature of 150 degrees K or less is a necessary but not sufficient condition for the existence of noctilucent clouds. Water vapor appears to be a critical ingredient in the occurrence of these clouds.
authors.forename: J S
authors.initials: JS
authors.lastname: Theon
authors.forename: W
authors.initials: W
authors.lastname: Nordberg
authors.forename: W S
authors.initials: WS
authors.lastname: Smith