Analysis of full-disc Hαobservations: Carrington maps and filament properties in 1909–2022 Article Swipe
Theodosios Chatzistergos
,
I. Ermolli
,
Dipankar Banerjee
,
Teresa Barata
,
Ioannis Chouinavas
,
M. Falco
,
R. Gafeira
,
F. Giorgi
,
Yoichiro Hanaoka
,
N. A. Krivova
,
V. V. Korokhin
,
Ana Lourenço
,
G. P. Marchenko
,
Jean-Marie Malherbe
,
N. Peixinho
,
P. Romano
,
Takashi Sakurai
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202347536
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1051/0004-6361/202347536
Context. Full-disc observations of the Sun in the H α line provide information about the solar chromosphere, and in particular, about the filaments, which are dark and elongated features that lie along magnetic field polarity-inversion lines. This makes them important for studies of solar magnetism. Because full-disc H α observations have been performed at various sites since the second half of the 19th century, with regular photographic data having started at the beginning of the 20th century, they are an invaluable source of information on past solar magnetism. Aims. We derive accurate information about filaments from historical and modern full-disc H α observations. Methods. We consistently processed observations from 15 H α archives spanning 1909–2022. The analysed datasets include long-running ones such as those from Meudon and Kodaikanal, but also previously unexplored datasets such as those from Arcetri, Boulder, Larissa, and Upice. Our data processing includes photometric calibration of the data stored on photographic plates, the compensation for limb-darkening, and the orientation of the data to align solar north at the top of the images. We also constructed Carrington maps from the calibrated H α images. Results. We find that filament areas, similar to plage areas in Ca II K data, are affected by the bandwidth of the observation. Thus, a cross calibration of the filament areas derived from different archives is needed. We produced a composite of filament areas from individual archives by scaling all of them to the Meudon series. Our composite butterfly diagram very distinctly shows the common features of filament evolution, that is, the poleward migration as well as a decrease in the mean latitude of filaments as the cycle progresses. We also find that during activity maxima, filaments cover ∼1% of the solar surface on average. The change in the amplitude of cycles in filament areas is weaker than in sunspot and plage areas. Conclusions. Analysis of H α data for archives with contemporaneous Ca II K observations allowed us to identify and verify archive inconsistencies, which also have implications for reconstructions of past solar magnetism and irradiance from Ca II K data.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202347536
- OA Status
- hybrid
- Cited By
- 12
- References
- 83
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4387128443
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4387128443Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1051/0004-6361/202347536Digital Object Identifier
- Title
-
Analysis of full-disc Hαobservations: Carrington maps and filament properties in 1909–2022Work title
- Type
-
articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
2023Year of publication
- Publication date
-
2023-09-28Full publication date if available
- Authors
-
Theodosios Chatzistergos, I. Ermolli, Dipankar Banerjee, Teresa Barata, Ioannis Chouinavas, M. Falco, R. Gafeira, F. Giorgi, Yoichiro Hanaoka, N. A. Krivova, V. V. Korokhin, Ana Lourenço, G. P. Marchenko, Jean-Marie Malherbe, N. Peixinho, P. Romano, Takashi SakuraiList of authors in order
- Landing page
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https://doi.org/10.1051/0004-6361/202347536Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
-
hybridOpen access status per OpenAlex
- OA URL
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https://doi.org/10.1051/0004-6361/202347536Direct OA link when available
- Concepts
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Protein filament, Physics, Solar prominence, Astrophysics, Chromosphere, Sunspot, Context (archaeology), Solar observatory, Magnetic field, Remote sensing, Astronomy, Spectral line, Geology, Paleontology, Biology, Quantum mechanics, GeneticsTop concepts (fields/topics) attached by OpenAlex
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12Total citation count in OpenAlex
- Citations by year (recent)
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2025: 3, 2024: 8, 2023: 1Per-year citation counts (last 5 years)
- References (count)
-
83Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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