Chatzistergos, Theodosios

Curriculum Vitae

Main Focus
I am an astrophysicist with a keen interest in historical solar observations and their implications for understanding past solar magnetism as well as long-term changes in solar activity and irradiance and their influence on Earth.

Curriculum Vitae
Education and Employment
2020/06-today Postdoc, MPS
2018/04-2020/05 Postdoc, INAF OAR
2017/06-2018/03 Postdoc, MPS
2013/10-2017/06 PhD, "Analysis of historical solar observations and long-term changes in solar irradiance", MPS and Georg August University of Göttingen, Germany

Award
2025 Kees de Jager Prize for the Best Article in the journal Solar Physics of 2024
2024 European Space Weather and Space Climate Association (E-SWAN) Alexander Chizhevsky Medal
2022 SCOSTEP Distinguished Young Scientist Award

Selected Publications

[8] (Astronomy & Astrophysics, 2025, Vol. 696, A204) Chatzistergos, T., Krivova, N. A., Solanki, S. K., et al. - Revisiting the SATIRE-S irradiance reconstruction: Heritage of Mt Wilson magnetograms and Ca II K observations
https://doi.org/10.1051/0004-6361/202554044

[7] (Solar Physics, 2024, Vol. 299, 2) Chatzistergos, T. — A Discussion of Implausible Solar Irradiance Variations since 1700
https://doi.org/10.1007/s11207-024-02262-6

[6] (Journal of Space Weather and Space Climate, 2024, Vol. 14, 9) Chatzistergos, T., Krivova, N. A., Ermolli, I. — Understanding the secular variability of solar irradiance: the potential of Ca II K observations
https://doi.org/10.1051/swsc/2024006

[5] (Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 252, 106150) Chatzistergos, T., Krivova, N. A., Yeo, K. L. — Long-term changes in solar activity and irradiance
https://doi.org/10.1016/j.jastp.2023.106150

[4] (Astronomy & Astrophysics, 2021, Vol. 665, A104) Chatzistergos, T., Krivova, N. A., Ermolli, I., et al. - Reconstructing solar irradiance from historical Ca ii K observations. I. Method and its validation
https://doi.org/10.1051/0004-6361/202141516

[3] (Astronomy & Astrophysics, 2020, Vol. 639, A88) Chatzistergos, T., Ermolli, I., Krivova, N. A., et al. — Analysis of full-disc Ca ii K spectroheliograms - III. Plage area composite series covering 1892–2019
https://doi.org/10.1051/0004-6361/202037746

[2] (Astronomy & Astrophysics, 2019, Vol. 626, A114) Chatzistergos, T., Ermolli, I., Solanki, S. K., et al. — Recovering the unsigned photospheric magnetic field from Ca ii K observations
https://doi.org/10.1051/0004-6361/201935131

[1] (Astronomy & Astrophysics, 2017, Vol. 602, A69) Chatzistergos, T., Usoskin, I. G., Kovaltsov, G. A., Krivova, N. A., & Solanki, S. K.  — New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods
https://doi.org/10.1051/0004-6361/201630045