Summary: Adv. Space Res. Vol. 1, pp.
© COSPAR, 1981. Printed in Great Britain.
MEASUREMENT OF MINOR
2, Cl, 03, NO) IN THE
EARTH'S ATMOSPHERE BY THE
S. K. Atreya
Department ofAtmospheric and Ocean Science, Space Physics
Research Laboratory, The University of Michigan, Ann
Arbor, Michigan 48109, USA
The stellar occultation technique is a clean and powerful means of detecting and
quantifying minor gases in the earth's atmosphere. The results obtained are
totally insensitive to knowledge of the absolute flux of the star, and are not in-
fluenced by instrument calibration problems. Pioneering observations of nocturnal
mesospheric ozone and thermospheric molecular oxygen by the stellar occultation
technique were made in 1970 and 1971 with the Wisconsin stellar photometers on
board the Orbiting Astronomical Observatory-2. A limb crossing geometry was used.