Theodosios Chatzistergos

@mps.mpg.de

Scientist
Max Planck institute for solar system research



                 

https://researchid.co/theochatzi

RESEARCH, TEACHING, or OTHER INTERESTS

Astronomy and Astrophysics

600

Scholar Citations

15

Scholar h-index

23

Scholar i10-index

RECENT SCHOLAR PUBLICATIONS

  • Rudolf Wolf to Alfred Wolfer: The transfer of the reference observer in the international sunspot number series (1876–1893)
    S Bhattacharya, L Lefevre, T Chatzistergos, H Hayakawa, M Jansen
    Solar Physics 299 (4), 1-36 2024

  • A Discussion of Implausible Total Solar-Irradiance Variations Since 1700
    T Chatzistergos
    Solar Physics 299 (2), 1-31 2024

  • Differential rotation of the solar chromosphere: a century-long perspective from Kodaikanal solar observatory Ca ii K data
    DK Mishra, S Routh, BK Jha, T Chatzistergos, J Basu, S Chatterjee, ...
    The Astrophysical Journal 961 (1), 40 2024

  • Understanding the secular variability of solar irradiance: the potential of Ca II K observations
    T Chatzistergos, NA Krivova, I Ermolli
    Journal of Space Weather and Space Climate 14, 9 2024

  • Solar observations by Angelo Secchi. I. Digitization of original documents and analysis of group numbers over the period of 1853–1878
    I Ermolli, T Chatzistergos, F Giorgi, VMS Carrasco, AJP Aparicio, ...
    The Astrophysical Journal Supplement Series 269 (2), 53 2023

  • The Extreme Space Weather Event of 1872 February: Sunspots, Magnetic Disturbance, and Auroral Displays
    H Hayakawa, EW Cliver, F Clette, Y Ebihara, S Toriumi, I Ermolli, ...
    The Astrophysical Journal 959 (1), 23 2023

  • Analysis of full-disc Hα observations: Carrington maps and filament properties in 1909–2022
    T Chatzistergos, I Ermolli, D Banerjee, T Barata, I Chouinavas, M Falco, ...
    Astronomy & Astrophysics 680, A15 2023

  • Differential Rotation of the Solar Chromosphere: A Century-long Perspective from Kodaikanal Solar Observatory Ca II K Data
    D Kirti Mishra, S Routh, BK Jha, T Chatzistergos, J Basu, S Chatterjee, ...
    arXiv e-prints, arXiv: 2311.18800 2023

  • Long-term changes in solar activity and irradiance
    T Chatzistergos, NA Krivova, KL Yeo
    Journal of Atmospheric and Solar-Terrestrial Physics 252, 106150 2023

  • VizieR Online Data Catalog: 1909-2022 Carrington filament properties (Chatzistergos+, 2023)
    T Chatzistergos, I Ermolli, D Banerjee, T Barata, I Chouinavas, M Falco, ...
    VizieR Online Data Catalog, J/A+ A/680/A15 2023

  • Reconstructing solar irradiance over the period 1996-2022
    I Ermolli, T Chatzistergos
    EGU General Assembly Conference Abstracts, EGU-16293 2023

  • Investigating the effect of solar ambient and data characteristics on Ca II K observations and line profile measurements
    M Murabito, I Ermolli, T Chatzistergos, S Jafarzadeh, F Giorgi, ...
    The Astrophysical Journal 947 (1), 18 2023

  • Recalibration of the sunspot-number: status report
    F Clette, L Lefvre, T Chatzistergos, H Hayakawa, VMS Carrasco, R Arlt, ...
    Solar Physics 298 (3), 44 2023

  • Is there a link between the length of the solar cycle and Earth’s temperature?
    T Chatzistergos
    Rendiconti Lincei. Scienze Fisiche e Naturali 34 (1), 11-21 2023

  • Firefly: The Case for a Holistic Understanding of the Global Structure and Dynamics of the Sun and the Heliosphere
    NE Raouafi, JT Hoeksema, JS Newmark, S Gibson, TE Berger, LA Upton, ...
     2023

  • Analysis of full-disc Hα observations: Carrington maps and filament properties in 1909–2022
    T Sakurai, GP Marchenko, T Chatzistergos, N Peixinho, T Barata, M Falco, ...
     2023

  • Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23–25
    I Ermolli, F Giorgi, T Chatzistergos
    Frontiers in Astronomy and Space Sciences 9, 1042740 2022

  • Reconstructing solar irradiance from Ca II K observations
    T Chatzistergos, N Krivova, I Ermolli, KL Yeo, S Solanki, C Puiu, F Giorgi, ...
    Authorea Preprints 2022

  • Full-disc Ca ii K observations—A window to past solar magnetism
    T Chatzistergos, NA Krivova, I Ermolli
    Frontiers in Astronomy and Space Sciences 9, 1038949 2022

  • Scrutinising the relationship between plage areas and sunspot areas and numbers
    T Chatzistergos, I Ermolli, NA Krivova, T Barata, S Carvalho, JM Malherbe
    Astronomy & Astrophysics 667, A167 2022

MOST CITED SCHOLAR PUBLICATIONS

  • New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods
    T Chatzistergos, IG Usoskin, GA Kovaltsov, NA Krivova, SK Solanki
    Astronomy & Astrophysics 602, A69 2017
    Citations: 89

  • Analysis of full disc Ca II K spectroheliograms-II. Towards an accurate assessment of long-term variations in plage areas
    T Chatzistergos, I Ermolli, NA Krivova, SK Solanki
    Astronomy & Astrophysics 625, A69 2019
    Citations: 48

  • Analysis of full disc Ca II K spectroheliograms-I. Photometric calibration and centre-to-limb variation compensation
    T Chatzistergos, I Ermolli, SK Solanki, NA Krivova
    Astronomy & Astrophysics 609, A92 2018
    Citations: 39

  • Analysis of full-disc Ca II K spectroheliograms-III. Plage area composite series covering 1892–2019
    T Chatzistergos, I Ermolli, NA Krivova, SK Solanki, D Banerjee, T Barata, ...
    Astronomy & Astrophysics 639, A88 2020
    Citations: 37

  • Recalibration of the sunspot-number: status report
    F Clette, L Lefvre, T Chatzistergos, H Hayakawa, VMS Carrasco, R Arlt, ...
    Solar Physics 298 (3), 44 2023
    Citations: 34

  • Recovering the unsigned photospheric magnetic field from Ca II K observations
    T Chatzistergos, I Ermolli, SK Solanki, NA Krivova, F Giorgi, KL Yeo
    Astronomy & Astrophysics 626, A114 2019
    Citations: 31

  • Dependence of the sunspot-group size on the level of solar activity and its influence on the calibration of solar observers
    IG Usoskin, GA Kovaltsov, T Chatzistergos
    Solar Physics 291 (12), 3793-3805 2016
    Citations: 24

  • Modelling a multi-spacecraft coronal mass ejection encounter with EUHFORIA
    E Asvestari, J Pomoell, E Kilpua, S Good, T Chatzistergos, M Temmer, ...
    Astronomy & Astrophysics 652, A27 2021
    Citations: 23

  • Delving into the Historical Ca ii K Archive from the Kodaikanal Observatory: The Potential of the Most Recent Digitized Series
    T Chatzistergos, I Ermolli, SK Solanki, NA Krivova, D Banerjee, BK Jha, ...
    Solar Physics 294 (10), 145 2019
    Citations: 21

  • Modelling solar irradiance from ground-based photometric observations
    T Chatzistergos, I Ermolli, F Giorgi, NA Krivova, CC Puiu
    Journal of Space Weather and Space Climate 10, 45 2020
    Citations: 20

  • Analysis of historical solar observations and long-term changes in solar irradiance
    T Chatzēstergos
    Dissertation, Gttingen, Georg-August Universitt, 2017 2017
    Citations: 20

  • Reconstructing solar irradiance from historical Ca II K observations-I. Method and its validation
    T Chatzistergos, NA Krivova, I Ermolli, KL Yeo, S Mandal, SK Solanki, ...
    Astronomy & Astrophysics 656, A104 2021
    Citations: 18

  • Full-disc Ca ii K observations—A window to past solar magnetism
    T Chatzistergos, NA Krivova, I Ermolli
    Frontiers in Astronomy and Space Sciences 9, 1038949 2022
    Citations: 17

  • Exploiting four historical Ca II K spectroheliogram archives
    T Chatzistergos, I Ermolli, SK Solanki, NA Krivova
    Coimbra solar physics meeting ground-based solar observations in the space 2016
    Citations: 17

  • A note on the sunspot and prominence records made by Angelo Secchi during the period 1871–1875
    VMS Carrasco, JM Nogales, JM Vaquero, T Chatzistergos, I Ermolli
    Journal of Space Weather and Space Climate 11, 51 2021
    Citations: 16

  • Long-term changes in solar activity and irradiance
    T Chatzistergos, NA Krivova, KL Yeo
    Journal of Atmospheric and Solar-Terrestrial Physics 252, 106150 2023
    Citations: 15

  • The potential of Ca II K observations for solar activity and variability studies
    I Ermolli, T Chatzistergos, NA Krivova, SK Solanki
    Proceedings of the International Astronomical Union 13 (S340), 115-120 2018
    Citations: 15

  • Ca II K spectroheliograms for studies of long-term changes in solar irradiance
    T Chatzistergos, I Ermolli, NA Krivova, SK Solanki
    Proceedings of the International Astronomical Union 13 (S340), 125-128 2018
    Citations: 15

  • Historical solar Ca II K observations at the Rome and Catania observatories
    T Chatzistergos, I Ermolli, M Falco, F Giorgi, SL Guglielmino, NA Krivova, ...
    arXiv preprint arXiv:1902.07483 2019
    Citations: 14

  • Scrutinising the relationship between plage areas and sunspot areas and numbers
    T Chatzistergos, I Ermolli, NA Krivova, T Barata, S Carvalho, JM Malherbe
    Astronomy & Astrophysics 667, A167 2022
    Citations: 13