OSIRIS Ozone

OSIRIS spectra of limb scattered sunlight are used to retrieve ozone number density vertical profiles over the altitude range from 10 to 60 km at a vertical resolution of approximately 1.5 km using the a Multiplicative Algebraic Reconstruction Technique, which is a one dimensional modification of a two-dimensional tomographic retrieval algorithm. This technique allows for the consistent merging of the absorption information from radiance measurements at wavelengths in the Chappuis and the Hartley-Huggins bands at each iteration of the inversion. A set of weighting factors is used to determine the importance of each line of sight and each element of the measurement vector for the retrieved state at each altitude.  Retrieval algorithm details can be found in Degenstein et al., 2009.

The current version of the ozone product is version 5.10, which implements a tangent altitude registration correction algorithm to correct a small long term drift.  See Bourassa et al., 2018.