Total Solar Irradiance (TSI) has been recorded daily by Total Solar Irradiance Monitors (TSIM) with overlapping
measurements on FY-3 (Feng Yun-3) series satellites since 2008. Instrument descriptions, operation in space and flight
performance of three TSIMs are presented in this paper. TSI is measured by electrical substitution radiometers integrated
in TSIM, with traceability to SI. TSIM/FY-3A and TSIM/FY-3B share nearly the same design. Since TSIM/FY-3A and
TSIM/FY-3B have no pointing system, the Sun is only observed when the Sunlight sweeps TSIM’s field-of-view and
TSI measurements are influenced inevitably by solar pointing errors. TSIM/FY-3C, a radiometer package was
constructed with a pointing system for solar tracking in order to achieve accurate solar pointing. TSIM/FY-3C was sent
into orbit in September 2013 onboard FY-3C satellite. Daily TSI measurements have been performed by TSIM/FY-3C
with autonomous accurate solar tracking for 1 year. TSIM/FY-3C is in a good instrument health according to its on-orbit
data.
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