Total solar irradiance since 1996: is there a long-term variation unrelated to solar surface magnetic phenomena?

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Steinhilber, F. (2010). Total solar irradiance since 1996: is there a long-term variation unrelated to solar surface magnetic phenomena? Astronomy and Astrophysics, 523, A39 (6 pp.). https://doi.org/10.1051/0004-6361/200811446