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)
Images from ESA’s Solar Orbiter offer the best look yet at a source region of the solar wind - and challenge our view of the continuous particle stream from the Sun.
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