Astronaut Scientific Debriefings, 1962-1963

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In a similar manner, the observations of the horizon and the extent of the atmosphere are of great interest in determining the distribution of various atmospheric characteristics. The precise lighting conditions regarding the position of the sun and the intensity of the outer edge of the horizon as observed by Colonel Glenn may be used in the consideration of what Glenn actually saw. For example, he may have seen the limit of the atmosphere (based on the 8 degree limb described in the press, the atmosphere apparently extended to over 150 Km) by Rayleigh scattering; he may have seen the airglow; or he may have seen the MIE scattering from dust in the atmosphere. The true limiting angle of his observations and a graph of the intensity drop-off with angle from the earth should be obtained in addition to the lighting conditions.

It is recommended that this information be obtained from Colonel Glenn as soon as possible.

Maurice Dubin

Head, Aeronomy Program

Geophysics & Astronomy Programs

Office of Space Sciences

SG
Fellows

SG
Clark