The Princeton University telescope on the Orbiting Astronomical Observatory 3 was used for occultation measurements of upper atmospheric species. The target star, β Cen, and observing date, July 26, 1975, were selected so that the line of sight grazed the earth's limb at local midnight. Observations at 2580, 2825, 2997, 3100, and 3428 Å 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°–12.5°S above approximately 75 km exceed our theoretical calculations and are not understood at the present time. A search for the 1188‐Å chlorine line in the 1187‐Å O2 absorption feature was carried out at tangent altitudes of 96–116 km. An upper limit to the atomic chlorine mixing ratio at 106 km of 3 ppb is found. This upper limit exceeds the expected value for atomic chlorine by a factor of approximately 2.5.
A total of 24 papers have been considered for inclusion in the special issue. These papers underwent the normal JGR reviewing process. With an impending polar mission to the Arctic in the fall of 1991, it was a Herculean effort for many of the authors and reviewers to participate in the preparation of this issue. We are therefore most grateful to our colleagues for their assistance. We trust that this issue will continue the "saga" of polar ozone depletion and will be but an intermediate step, as the scientific community unravels the complex and fascinating chemical, dynamical, and radiative processes at work in the polar stratosphere.
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