2025 Kees de Jager Prize
For the Best Article in the journal Solar Physics of 2024
28 May 2025
The Kees de Jager Prize, established in 2021, is awarded annually by Springer Nature to the best article in the journal Solar Physics. The winner is selected by the Editorial Board from all publications of the previous year.
The 2025 Kees de Jager Prize is awarded to Theodosios Chatzistergos for the article «A Discussion of Implausible Total Solar-Irradiance Variations Since 1700». Solar Physics 299, 21 (2024).
This article presents results derived from an analysis of the Total Solar Irradiance (TSI) reconstruction for the period 1700–1992 presented by Hoyt and Schatten (1993; HS93), which is still frequently used and often featured in discussions of the role of the Sun in Earth’s climate change being in a good agreement with Earth’s temperature measurements.
The author carries out a thorough analysis of the data and assumptions applied by HS93, as well as of the data and methods used in some recent studies aiming to extend the HS93 TSI series to recent years. This article shows that the original results in HS93 and the recent updates of the HS93 series suffer from improper analysis. Since this series conflicts with the TSI series used by the Intergovernmental Panel on Climate Change (IPCC) to assess the causes and trends of the Earth’s climate change, and this condition is emphasized in some works presented in the literature, the results shown in this article are of considerable importance for the accurate analysis of the role of the Sun in Earth’s climate change.
[from anonymous reviewer’s report]
This award is honoring the founding editor of the journals Solar Physics and Space Science Reviews as well as the book series Astrophysics and Space Science Library – Cornelis «Kees» de Jager, who passed away in 2021 at the age of 100, and is acknowledging the work of our authors by highlighting outstanding research articles. It carries a certificate and a cash award of €1000 sponsored by Springer Nature.
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