Speaker
Description
Direct measurements of solar irradiance have only been available since the late 1970s, making models essential for reconstructing earlier values.
Variations in solar irradiance on timescales longer than a day are primarily driven by changes in the Sun's surface magnetic field, which manifests as bright faculae and network features or dark sunspots.
Accurate irradiance modeling therefore depends on detailed information about the evolution of these magnetic features.
SATIRE (Spectral And Total Irradiance REconstruction) is among the most advanced models for this purpose.
It simulates the brightness of sunspots, faculae, and the quiet Sun using radiative transfer codes and solar model atmospheres, while solar observations are used to derive the spatial distribution of each component.
A previous version, SATIRE-S, utilized magnetograms from four sources (HMI, MDI, and two sets from the Kitt Peak National Observatory), each covering roughly one solar cycle.
The limited overlap between these datasets introduced uncertainty in the long-term irradiance trend.
Here we present a revised version of the SATIRE-S model that incorporates additional magnetogram sources, thereby improving the continuity of data and significantly reducing uncertainty in long-term total solar irradiance changes during the satellite era.
Importantly, the new data also cover the entire ACRIM gap, enabling an independent assessment of the ACRIM-gap controversy.
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