Bhattacharya, S.; Lefèvre, L.; Chatzistergos, T.; Hayakawa, H.; Jansen, M.: Rudolf Wolf to Alfred Wolfer: The Transfer of the Reference Observer in the International Sunspot Number Series (1876–1893). Solar Physics 299, p. 45 (2024)
Carrasco, V. M. S.; Aparicio, A. J. P.; Chatzistergos, T.; Jamali Jaghdani, S.; Hayakawa, H.; Gallego, M. C.; Vaquero, J. M.: Understanding Solar Activity after the Maunder Minimum: Sunspot Records by Rost and Alischer. The Astrophysical Journal 968, p. 65 (2024)
Chatzistergos, T.; Krivova, N. A.; Ermolli, I.: Understanding the secular variability of solar irradiance: the potential of Ca II K observations. Journal of Space Weather and Space Climate 14, p. 9 (2024)
Chatzistergos, T.; Krivova, N. A.; Ermolli, I.: Understanding the secular variability of solar irradiance: the potential of Ca II K observations. Journal of Space Weather and Space Climate 14, p. 9 (2024)
Jha, B. K.; Chatzistergos, T.; Banerjee, D.; Ermolli, I.; Krivova, N. A.; Solanki, S. K.; Priyadarshi, A.: Butterfly Diagram and Other Properties of Plage Areas from Kodaikanal Ca II K Photographs Covering 1904 – 2007. Solar Physics 299, p. 166 (2024)
Mishra, D. K.; Routh, S.; Jha, B. K.; Chatzistergos, T.; Basu, J.; Chatterjee, S.; Banerjee, D.; Ermolli, I.: Differential Rotation of the Solar Chromosphere: A Century-long Perspective from Kodaikanal Solar Observatory Ca II K Data. The Astrophysical Journal 961, p. 40 (2024)
Clette, F.; Lefèvre, L.; Chatzistergos, T.; Hayakawa, H.; Carrasco, V. M. S.; Arlt, R.; Cliver, E. W.; Dudok de Wit, T.; Friedli, T. K.; Karachik, N.et al.; Kopp, G.; Lockwood, M.; Mathieu, S.; Muñoz-Jaramillo, A.; Owens, M.; Pesnell, D.; Pevtsov, A.; Svalgaard, L.; Usoskin, I. G.; van Driel-Gesztelyi, L.; Vaquero, J. M.: Recalibration of the Sunspot-Number: Status Report. Solar Physics 298, 44 (2023)
Murabito, M.; Ermolli, I.; Chatzistergos, T.; Jafarzadeh, S.; Giorgi, F.; Rouppe van der Voort, L.: Investigating the Effect of Solar Ambient and Data Characteristics on Ca II K Observations and Line Profile Measurements. The Astrophysical Journal 947, p. 18 (2023)
Chatzistergos, T.; Ermolli, I.; Krivova, N. A.; Barata, T.; Carvalho, S.; Malherbe, J.-M.: Scrutinising the relationship between plage areas and sunspot areas and numbers. Astronomy and Astrophysics 667, p. A167 (2022)
Chatzistergos, T.; Krivova, N.; Ermolli, I.: Full-disc Ca II K observations-A window to past solar magnetism. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2022)
Ermolli, I.; Giorgi, F.; Chatzistergos, T.: Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23-25. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2022)
Carrasco, V. M. S.; Nogales, J. M.; Vaquero, J. M.; Chatzistergos, T.; Ermolli, I.: A note on the sunspot and prominence records made by Angelo Secchi during the period 1871–1875. Journal of Space Weather and Space Climate 11, 51 (2021)
Chatzistergos, T.; Krivova, N. A.; Ermolli, I.; Yeo, K. L.; Mandal, S.; Solanki, S. K.; Kopp, G.; Malherbe, J.-M.: Reconstructing solar irradiance from historical Ca II K observations: I. Method and its validation. Astronomy and Astrophysics 656, A104 (2021)
Chatzistergos, T.; Ermolli, I.; Giorgi, F.; Krivova, N. A.; Puiu, C.C.: Modelling solar irradiance from ground-based photometric observations. Journal of Space Weather and Space Climate 10, 45 (2020)
Chatzistergos, T.; Ermolli, I.; Krivova, N. A.; Solanki, S. K.: Historical solar Ca II K observations at the Kyoto and Sacramento Peak observatories. Journal of Physics: Conference Series 1548 (1), 012007 (2020)
How does our star heat its outer atmosphere, the solar corona, to unimaginable temperatures of up to 10 million degrees Celsius? With unprecedented observational data from ESA's Solar Orbiter spacecraft and powerful computer simulations, ERC starting grant awardee Pradeep Chitta intends to bring new momentum to the search for the coronal heating mechanism.
The research group “Solar Lower Atmosphere and Magnetism” (SLAM) studies the conditions and dynamic processes in the atmospheric layer between the solar surface (photosphere) and the overlying chromosphere, an approximately 2000 km thick gas layer.
The main research fields of the department "Sun and Heliosphere" are covered by the research groups "Solar and Stellar Coronae", "Solar Lower Atmosphere and Magnetism", "Solar and Stellar Magnetohydrodynamics" and "Solar Variability and Climate".