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Articles by Theodosios Chatzistergos

Butterfly Diagram and Other Properties of Plage Areas from Kodaikanal Ca II K Photographs Covering 1904-2007
23 August 2024 by Bibhuti Kumar Jha and others
Solar and Stellar Astrophysics
Differential Rotation of the Solar Chromosphere: A Century-long Perspective from Kodaikanal Solar Observatory Ca II K Data
30 November 2023 by Dibya Kirti Mishra and others at LogoIndian Institute of Astrophysics
Solar and Stellar Astrophysics
Analysis of full-disc H alpha observations: Carrington maps and filament properties in 1909-2022
18 October 2023 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Long-term changes in solar activity and irradiance
1
16 October 2023 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics, Space Physics
Investigating the effect of solar ambient and data characteristics on Ca II K observations and line profile measurements
30 March 2023 by Mariariata Murabito and others
Solar and Stellar Astrophysics
Re-calibration of the Sunspot Number: Status Report
5 January 2023 by Frederic Clette and others
Solar and Stellar Astrophysics, Space Physics
Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23-25
18 November 2022 by Ilaria Ermolli and others
Solar and Stellar Astrophysics, Instrumentation and Methods for Astrophysics
Full-disc Ca II K observations -- a window to past solar magnetism
24 October 2022 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Scrutinizing the relationship between plage areas and sunspot areas and numbers
15 September 2022 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Reconstructing solar irradiance from historical Ca II K observations. I. Method and its validation
13 September 2021 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics, Earth and Planetary Astrophysics
Modelling a multi-spacecraft coronal mass ejection encounter with EUHFORIA
25 May 2021 by Eleanna Asvestari and others
Solar and Stellar Astrophysics
Modeling stellar Ca II H & K emission variations. I. Effect of inclination on the S-index
25 March 2021 by Krishnamurthy Sowmya and others
Solar and Stellar Astrophysics
Modelling solar irradiance from ground-based photometric observations
24 August 2020 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
4 May 2020 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Delving into the Historical Ca II K Archive from the Kodaikanal Observatory: the Potential of the Most Recent Digitised Series
15 August 2019 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Recovering the unsigned photospheric magnetic field from Ca II K observations
9 May 2019 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Historical solar Ca II K observations at the Rome and Catania observatories
20 February 2019 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Analysis of full disc Ca II K spectroheliograms. II. Towards an accurate assessment of long-term variations in plage areas
19 February 2019 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
The potential of Ca II K observations for solar activity and variability studies
11 May 2018 by Ilaria Ermolli and others
Solar and Stellar Astrophysics
Ca II K spectroheliograms for studies of long-term changes in solar irradiance
10 May 2018 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Analysis of full disc Ca II K spectroheliograms. I. Photometric calibration and CLV compensation
13 October 2017 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
New reconstruction of the sunspot group number since 1739 using the direct calibration and "backbone" methods
27 February 2017 by Theodosios Chatzistergos and others
Solar and Stellar Astrophysics
Dependence of the Sunspot-group Size on the Level of Solar Activity and its Influence on the Calibration of Solar Observers
2 September 2016 by I. Usoskin and others
Solar and Stellar Astrophysics