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\begin{document}

\title{An Improved Solar Spectral Irradiance Composite Record}



\author[1]{Thomas N. Woods}%
\author[2]{Matthew Todd DeLand}%
\affil[1]{Laboratory for Atmospheric and Space Physics}%
\affil[2]{SSAI}%


\vspace{-1em}



  
  \date{June 18, 2024}


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\begin{abstract}
The solar spectral irradiance (SSI) data set is a key record for
studying and understanding the energetics and radiation balance in
Earth's environment. Understanding the long-term variations of the SSI
over time scales of the 11-year solar activity cycle and longer is
critical for many Sun-climate research topics. There are satellite
measurements of the SSI since the 1970s that contribute to understanding
the solar variability over Solar Cycles (SC) 21 to 24, with most of
these SSI measurements in the ultraviolet and only recently in the
visible and near infrared for SC-23 and SC-24. A limiting factor for the
accuracy of the previous results is the uncertainties for the instrument
degradation corrections. Analyses of the past SSI data sets have
identified some irradiance offsets and some small residual instrumental
trends. These corrections are applied and then combined with a previous
SSI composite data set, called the GSFCSSI2 composite, to provide a new
SSI composite, called the LASP GSFC SSI \#3 (or SSI3). This improved
composite extends the wavelength coverage down to 0.5 nm and up to 1600
nm and the time coverage up to 2020. The solar variability results from
the SSI3 are consistent, of course, with the observations from which are
used to create the SSI3, but they do differ with some solar variability
models, in particular at longer than 900 nm. The development of the SSI3
composite also clarifies the importance of overlapping missions for
studying the 11-year solar activity cycle, particularly for wavelengths
longer than 200 nm.%
\end{abstract}%



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