title: Visual Observations of Nightglow from Manned Spacecraft.
abstract: The luminous band around the horizon noted by J. Glenn in the first U.S. manned orbital flight is attributable to airglow. Dip-of-the-horizon measurements on the star gamma Ursae Majoris showed that the band is centered at an elevation of 91 kilometers or somewhat higher. The edge-on brightness of the airglow layer was 6 x 10(-7) candles per square centimeter.
authors.forename: M S
authors.initials: MS
authors.lastname: Carpenter
authors.forename: J A
authors.initials: JA
authors.lastname: O'keefe
authors.forename: L
authors.initials: L
authors.lastname: Dunkelman