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The mesospheric ozone density at a height of 88 km has been deduced from simultaneous ground‐based observations of neutral sodium density and sodium nightglow intensity, using a photochemical equilibrium model. The data have been obtained at São José dos Campos (23°S, 46°W). Sodium densities are measured as a function of height between 76 and 106 km by laser radar, and the nightglow intensities by a tilting filter photometer. The ozone density shows a strong seasonal variation with well defined maxima at the equinoxes, and a mean annual value of 8 × 107 cm−3. The average nocturnal variation shows a factor of 2 increase between sunset and sunrise.
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Kirchhoff et al. (1981) studied this question.
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