Stellar occultation measurements of atmospheric ozone and chlorine from OAO3

Details Stellar occultation measurements of atmospheric ozone and chlorine from OAO3 Stellar occultation measurements of atmospheric ozone and chlorine from OAO3

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4997r&link_type=abstract

Journal of Geophysical Research, vol. 81, Oct. 1, 1976, p. 4997-5001.

Astronomy and Astrophysics

Astronomy

7

Absorption Spectra, Atmospheric Chemistry, Chlorine, Ozone, Satellite Observation, Stellar Occultation, Density Measurement, Gas Density, Oao 3, Ozonometry, Spaceborne Telescopes, Upper Atmosphere

Scientific paper

The Princeton University telescope on the Orbiting Astronomical Observatory 3 was used for occultation measurements of upper-atmospheric species. The target star, Beta Cen, and observing date were selected so that the line of sight grazed earth's limb at local midnight. Observations at 2580, 2825, 2997, 3100, and 3428 A produced ozone absorption data of high statistical accuracy between 48-km and 114-km tangent altitude. Near-exponential density profiles are obtained up to 85 km. Near 100 km, a significant density excess above the extrapolated low-altitude profile is observed. Near-equatorial observations at altitudes up to approximately 75 km agree well with theoretical calculations. Ozone densities measured at 6.5 to 12.5 deg S latitude above approximately 75 km exceed the theoretical calculations and are not understood at the present time. A search for the 1188-A chlorine line in the 1187-A O2 absorption feature was carried out at tangent altitudes of 96-116 km. An upper limit of 3 ppb to the atomic chlorine mixing ratio at 106 km is found. This upper limit exceeds the expected value for atomic chlorine by a factor of approximately 2.5.

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