Publications of Theodosios Chatzistergos

Journal Article (21)

21.
Journal Article
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)

Conference Paper (1)

22.
Conference Paper
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)

Talk (8)

23.
Talk
Chatzistergos, T.; Solanki, S. K.; Krivova, N. A.; Ermolli, I.; Giorgi, F.; Yeo, K. L.: Connecting chromospheric emission to photospheric magnetic field. AG 2017, Göttingen, Germany (2017)
24.
Talk
Chatzistergos, T.; Solanki, S. K.; Krivova, N. A.; Ermolli, I.; Giorgi, F.; Yeo, K. L.: Relating photospheric magnetic field to Ca II K intensity. Rocks \& Stars II, Göttingen, Germany (2017)
25.
Talk
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)
26.
Talk
Chatzistergos, T.; Ermolli, I.; Solanki, S. K.; Krivova, N. A.: Examination of historical spectroheliogram archives. Space climate symposium 6, Levi, Finland (2016)
27.
Talk
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)
28.
Talk
Chatzistergos, T.; Ermolli, I.; Solanki, S. K.; Krivova, N. A.: Exploring historical Ca II K spectroheliogram archives. XIVth Hvar astrophysical colloquium, Hvar, Croatia (2016)
29.
Talk
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)
30.
Talk
Krivova, N.; Wu, C. J.; Dasi Espuig, M.; Chatzistergos, T.; Yeo, K. L.; Solanki, S. K.: Reconstructions of past solar irradiance. International Space Climate Symposium-6, Levi, Finland (2016)

Poster (1)

31.
Poster
Chatzistergos, T.; Ermolli, I.; Krivova, N. A.; Solanki, S. K.: Handling historical Ca II K spectroheliogram observations. AGU Fall Meeting, San Francisco, USA (2016)
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