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Instrument: TOMS : Total Ozone Mapping Spectrometer
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The TOMS program began with the launch of TOMS Flight Model #1 on the Nimbus-7 spacecraft on October 24, 1978. Valid measurements started in November of that same year and the instrument continued to return data long after all other on-board experiments had failed. The TOMS instrument fell silent in May 1993. The software to derive useful information from the data returned by Nimbus 7 TOMS is the basis for the algorithm used to analyze all TOMS data and has gone through a lengthly evolutionary process bring it to the current version. The Version 7 processed data include a revised instrument calibration based on analysis of the entire 14.5 year data record (including a correction for a 0.2 nm wavelength error which caused a 3% absolute offset relative to Dobson) as well as an improved algorithm.

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