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 l50 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 itltensity 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
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SG_........fl ______
Fellows