The Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (MAESTRO) instrument on the SCISAT satellite is a simple, compact spectrophotometer for the measurement of atmospheric extinction, ozone, nitrogen dioxide, and other trace gases in the stratosphere and upper troposphere as part of the Atmospheric Chemistry Experiment (ACE) mission. We provide an overview of the instrument from requirements to realization, including optical design, prelaunch and on-orbit performance, and a preliminary examination of retrievals of ozone and NO(2).

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The first measurements of the spectral flux on a horizontal surface, limb brightness and apparent surface brightness beneath the NASA ER‐2 research aircraft were made during the Stratospheric Photochemistry, Aerosol and Dynamics Expedition (SPADE) of the NASA High‐Speed Research Program. Results from the May, 1993 campaign are presented. J‐values for the production of O(¹D) from the photodissociation of ozone and the photodissociation rate of NO2 to form NO have been determined and are compared to the currently used, modelled values.

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