Fig. 8.


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Ratios of TSI measurements with the PREMOS’s Sensor A (primary radiometer) to its Sensor B (backup radiometer) track solar exposure dependent changes in the primary, which has degraded by 3500 ppm after an initial 400 ppm increase at the beginning of the mission. This is a greater change than any other instrument experienced in the first two years of operation (plot courtesy of PREMOS team).

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