58 citations · 290 across the 8 of their papers we have counts for
12 papers
Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23-25
Ilaria Ermolli, Fabrizio Giorgi, Theodosios Chatzistergos
The Rome Precision Solar Photometric Telescope (Rome/PSPT) is a ground-based telescope engaged in precision solar photometry. It has a 27-year database of full-disk images of the p…
Full-disc Ca II K observations -- a window to past solar magnetism
Theodosios Chatzistergos, Natalie A. Krivova, Ilaria Ermolli
First such observations were made in 1892 and since then various sites around the world have carried out regular observations, with Kodaikanal, Meudon, Mt Wilson, and Coimbra being…
Scrutinizing the relationship between plage areas and sunspot areas and numbers
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +3
Studies and reconstructions of past solar activity require data on sunspots as well as faculae/plage and network. Such data are also important for understanding the magnetic activi…
Modelling solar irradiance from ground-based photometric observations
Theodosios Chatzistergos, Ilaria Ermolli, Fabrizio Giorgi +2
Total solar irradiance (TSI) has been monitored from space since 1978. The measurements show a prominent variability in phase with the solar cycle, as well as fluctuations on times…
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +16
We derive the plage area evolution over the last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet u…
Delving into the Historical Ca II K Archive from the Kodaikanal Observatory: the Potential of the Most Recent Digitised Series
Theodosios Chatzistergos, Ilaria Ermolli, Sami K. Solanki +4
Full-disc Ca II K photographic observations of the Sun carry direct information about the evolution of solar-plage regions for more than a century and are therefore a unique datase…