Abstract
The Solar Irradiance Science Team #2 (SIST-2) program is a
competitively solicited National Aeronautics and Space Administration
(NASA) Earth Science Division (ESD) science research program providing
three-year awards beginning in July 2018 to quantify and understand the
solar irradiance variability and implications for Earth’s climate and
atmospheric composition. The purpose for the SIST-2 program is limited
to the accurate specification of the incoming solar irradiance into the
Earth system considering the 44-year satellite data record as well as
proxies to which the satellite record can be tied. The SIST-2 program
funded eight research grants to study the variability of the total solar
irradiance (TSI) and solar spectral irradiance (SSI) and to develop
improved space-based data sets, solar proxies, and variability models of
the solar irradiance. The SIST-2 projects are briefly introduced.