The Transition Region and Coronal Explorer (TRACE) is a NASA Small Explorer
(SMEX) mission to image the solar corona and transition region at high angular
and temporal resolution. The TRACE project ...
Reconstructed solar total and background irradiances.
11-yr Tootal Solar Irradiance (TSI) component since 1874 is from Foukal and
Lean: earlier from Hoyt Sunspot Groups
Background Brightness component ...