Understanding the secular variability of solar irradiance: the potential of Ca II K observations
With the increasing concern about climate change, it is important to have accurate information on the individual contributions by the potential driving agents, solar variability being one of them. Long and reliable records of solar irradiance, which describe the solar radiative energy input into the...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2024-01-01
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| Series: | Journal of Space Weather and Space Climate |
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| Online Access: | https://www.swsc-journal.org/articles/swsc/full_html/2024/01/swsc230049/swsc230049.html |
| _version_ | 1827278775446929408 |
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| author | Chatzistergos Theodosios Krivova Natalie A. Ermolli Ilaria |
| author_facet | Chatzistergos Theodosios Krivova Natalie A. Ermolli Ilaria |
| author_sort | Chatzistergos Theodosios |
| collection | DOAJ |
| description | With the increasing concern about climate change, it is important to have accurate information on the individual contributions by the potential driving agents, solar variability being one of them. Long and reliable records of solar irradiance, which describe the solar radiative energy input into the climate system, are essential for assessing the role of the Sun. The short temporal extent (since the 1970s) of direct space-based irradiance measurements leaves reconstructions of the past variability with the help of models as the only avenue. Such models require information on the surface distribution and evolution of solar magnetic regions, dark sunspots and bright faculae, and network regions. However, such data become increasingly scarce and of diminishing quality further back in time. Prior to the period of direct irradiance measurements, reconstructions mainly rely on sunspot observations or other indirect data to describe facular and network regions. The resulting estimates of the long-term change between the Maunder minimum and the present diverge by about an order of magnitude. Having direct information on bright magnetic regions can help resolve these discrepancies. The by far most promising data for this purpose are the full-disc observations of the Sun in the Ca II K line. Despite the wealth of such data all the way back to 1892, their use up to now has been rather limited, owing to a number of intricacies of the data. Here we review the recent efforts to bring Ca II K datasets to their full potential. We briefly discuss the problems plaguing the data and processing methods that have been developed to account for them before switching to a summary of the products derived from them. Focus is given to reconstructions of total and spectral irradiance variations from Ca II K observations. We summarise the available such reconstructions and discuss various aspects requiring further attention in order to allow Ca II K observations to be used to their full potential and thus eventually more accurate irradiance reconstructions back to 1892. |
| first_indexed | 2024-04-24T08:06:50Z |
| format | Article |
| id | doaj.art-1bdd93bb2528449ca92e52cbec35508a |
| institution | Directory Open Access Journal |
| issn | 2115-7251 |
| language | English |
| last_indexed | 2024-04-24T08:06:50Z |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Journal of Space Weather and Space Climate |
| spelling | doaj.art-1bdd93bb2528449ca92e52cbec35508a2024-04-17T09:16:18ZengEDP SciencesJournal of Space Weather and Space Climate2115-72512024-01-0114910.1051/swsc/2024006swsc230049Understanding the secular variability of solar irradiance: the potential of Ca II K observationsChatzistergos Theodosios0https://orcid.org/0000-0002-0335-9831Krivova Natalie A.1https://orcid.org/0000-0002-1377-3067Ermolli Ilaria2https://orcid.org/0000-0003-2596-9523Max Planck Institute for Solar System ResearchMax Planck Institute for Solar System ResearchINAF Osservatorio Astronomico di RomaWith the increasing concern about climate change, it is important to have accurate information on the individual contributions by the potential driving agents, solar variability being one of them. Long and reliable records of solar irradiance, which describe the solar radiative energy input into the climate system, are essential for assessing the role of the Sun. The short temporal extent (since the 1970s) of direct space-based irradiance measurements leaves reconstructions of the past variability with the help of models as the only avenue. Such models require information on the surface distribution and evolution of solar magnetic regions, dark sunspots and bright faculae, and network regions. However, such data become increasingly scarce and of diminishing quality further back in time. Prior to the period of direct irradiance measurements, reconstructions mainly rely on sunspot observations or other indirect data to describe facular and network regions. The resulting estimates of the long-term change between the Maunder minimum and the present diverge by about an order of magnitude. Having direct information on bright magnetic regions can help resolve these discrepancies. The by far most promising data for this purpose are the full-disc observations of the Sun in the Ca II K line. Despite the wealth of such data all the way back to 1892, their use up to now has been rather limited, owing to a number of intricacies of the data. Here we review the recent efforts to bring Ca II K datasets to their full potential. We briefly discuss the problems plaguing the data and processing methods that have been developed to account for them before switching to a summary of the products derived from them. Focus is given to reconstructions of total and spectral irradiance variations from Ca II K observations. We summarise the available such reconstructions and discuss various aspects requiring further attention in order to allow Ca II K observations to be used to their full potential and thus eventually more accurate irradiance reconstructions back to 1892.https://www.swsc-journal.org/articles/swsc/full_html/2024/01/swsc230049/swsc230049.htmlsolar variabilitysolar activityspectral irradiancetotal irradiance |
| spellingShingle | Chatzistergos Theodosios Krivova Natalie A. Ermolli Ilaria Understanding the secular variability of solar irradiance: the potential of Ca II K observations Journal of Space Weather and Space Climate solar variability solar activity spectral irradiance total irradiance |
| title | Understanding the secular variability of solar irradiance: the potential of Ca II K observations |
| title_full | Understanding the secular variability of solar irradiance: the potential of Ca II K observations |
| title_fullStr | Understanding the secular variability of solar irradiance: the potential of Ca II K observations |
| title_full_unstemmed | Understanding the secular variability of solar irradiance: the potential of Ca II K observations |
| title_short | Understanding the secular variability of solar irradiance: the potential of Ca II K observations |
| title_sort | understanding the secular variability of solar irradiance the potential of ca ii k observations |
| topic | solar variability solar activity spectral irradiance total irradiance |
| url | https://www.swsc-journal.org/articles/swsc/full_html/2024/01/swsc230049/swsc230049.html |
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