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Relative changes in ratios of simultaneous TSI measurements with the TIM’s Cone B (primary radiometer) to its Cone A (secondary radiometer) indicate solar exposure dependent changes in the primary. The TIM shows lower degradation than any other flight radiometer, with only 200 ppm of change in the primary cavity after 10 years on orbit. This degradation very nearly follows a classic exponential, with a fit shown (blue).
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