Chatzistergos, T.; Usoskin, I. G.; Kovaltsov, G. A.; Krivova, N. A.; Solanki, S. K.: New reconstruction of the sunspot group numbers since 1739 using the direct calibration and “backbone” methods. Astronomy and Astrophysics 602, A69 (2017)
Usoskin, I. G.; Kovaltsov, G. A.; Chatzistergos, T.: Dependence of the sunspot-group size on the level of solar activity and its influence on the calibration of solar observers. Solar Physics 291, pp. 3793 - 3805 (2016)
Chatzistergos, T.; Ermolli, I.; Solanki, S. K.; Krivova, N. A.: Exploiting four historical Ca II K spectroheliogram archives. Publications of the astronomical society of the pacific 504, pp. 227 - 231 (2016)
Chatzistergos, T.; Usoskin, I. G.; Kovaltsov, G. A.; Krivova, N. A.; Solanki, S. K.: New calibration of the group sunspot number series using a non-linear non-parametric method. DPG-Frühjahrstagung, Bremen (2017)
Chatzistergos, T.; Ermolli, I.; Solanki, S. K.; Krivova, N. A.: The potential of historical spectroheliograms for Sun-climate studies. 9th IAGA - ICMA/IAMAS - ROSMIC/VarSITI/SCOSTEP workshop on long-term changes and trends in the atmosphere, Kühlungsborn, Germany (2016)
Chatzistergos, T.; Usoskin, I.; Kovaltsov, G. A.; Krivova, N. A.; Solanki, S. K.: Non-linear re-calibration of group sunspot number series back to 1739. AGU Fall Meeting, San Francisco, USA (2016)
Application deadline 1 October 2024. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
First Light for Sunrise III: the first tests with real sunlight were successful. The balloon-borne solar observatory should be ready for launch at the end of May.
In analyzing solar observations from the 19th century, scientists are turning to amateur researchers for help. The project will allow to better understand the history of our star.
Astronomical teamwork: By combining data from Solar Orbiter and SDO, a group of researchers has unambiguously determined the magnetic field at the solar surface.
Application deadline 1 October 2023. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
Philipp Löschl has co-authored an excellent publication on Solar Orbiter data which has been awarded best Solar Physics paper of 2022 (Gherardo Valori et al. 2022)
IMPRS alumn Yuto Bekki is given a honourable mention by the IAU Division E Sun and Heliosphere for his PhD thesis “Theory of solar oscillations in the inertial frequency range”