The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues

In this work, we analysed both the evolution over time and the north–south (N-S) asymmetry of certain solar features with regards to their morphological type and area. We examined and compared simultaneously 4212 photospheric sunspot groups and 5781 chromospheric solar plage groups using data from t...

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Detalles Bibliográficos
Autores: de Paula Vila, Víctor, Curto, Juan José
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:20.500.14342/5414
Acceso en línea:http://hdl.handle.net/20.500.14342/5414
https://doi.org/10.1007/s11207-020-01648-6
Access Level:acceso abierto
Palabra clave:Sunspots
Cortie classification
Zürich classification
Solar plages
N-S asymmetry
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spelling The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Cataloguesde Paula Vila, VíctorCurto, Juan JoséSunspotsCortie classificationZürich classificationSolar plagesN-S asymmetryIn this work, we analysed both the evolution over time and the north–south (N-S) asymmetry of certain solar features with regards to their morphological type and area. We examined and compared simultaneously 4212 photospheric sunspot groups and 5781 chromospheric solar plage groups using data from the Ebro Observatory catalogues for the period 1910–1937. We found that the most frequently recorded groups of sunspots and solar plages are the smallest ones, and the total number of occurrences of these groups is, on average, about 23% higher for solar plages than for sunspots. Concerning the N-S asymmetry, when the northern hemisphere becomes predominant, it dominates the other hemisphere for a longer time than the opposite case and shows a higher asymmetry. In addition, we found that the normalized N-S asymmetry index, δ, of solar activity in terms of the occurrence of sunspots and solar plage groups follows approximately the same behaviour regardless of the morphological type, but presents a slight dependence on their area, since sunspot and solar plage groups show higher values of the δ index, the larger their areas are. Furthermore, we noticed three highly significant extremes in the N-S asymmetry, located around the minima of the 14th, 15th and 16th solar cycles (1912 [S]; 1924 [N]; 1933 [N]). However, the general trend is not equal in both structures, since in contrast to sunspots, solar plage groups present lower values of asymmetry throughout practically all the period under consideration. These facts could be interpreted in terms of magnetic cancellation processes and/or merging of close-by faculae.info:eu-repo/semantics/acceptedVersionSpringer NatureUniversitat Ramon Llull. Observatori de l'Ebre2020info:eu-repo/semantics/article40http://hdl.handle.net/20.500.14342/5414https://doi.org/10.1007/s11207-020-01648-6reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésSolar Phys (2020) 295:99Attribution-NonCommercial-NoDerivatives 4.0 International© L'autor/ahttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:20.500.14342/54142026-05-29T05:05:01Z
dc.title.none.fl_str_mv The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
title The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
spellingShingle The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
de Paula Vila, Víctor
Sunspots
Cortie classification
Zürich classification
Solar plages
N-S asymmetry
title_short The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
title_full The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
title_fullStr The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
title_full_unstemmed The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
title_sort The Evolution over Time and North–South Asymmetry of Sunspots and Solar Plages for the Period 1910 to 1937 Using Data from Ebro Catalogues
dc.creator.none.fl_str_mv de Paula Vila, Víctor
Curto, Juan José
author de Paula Vila, Víctor
author_facet de Paula Vila, Víctor
Curto, Juan José
author_role author
author2 Curto, Juan José
author2_role author
dc.contributor.none.fl_str_mv Universitat Ramon Llull. Observatori de l'Ebre
dc.subject.none.fl_str_mv Sunspots
Cortie classification
Zürich classification
Solar plages
N-S asymmetry
topic Sunspots
Cortie classification
Zürich classification
Solar plages
N-S asymmetry
description In this work, we analysed both the evolution over time and the north–south (N-S) asymmetry of certain solar features with regards to their morphological type and area. We examined and compared simultaneously 4212 photospheric sunspot groups and 5781 chromospheric solar plage groups using data from the Ebro Observatory catalogues for the period 1910–1937. We found that the most frequently recorded groups of sunspots and solar plages are the smallest ones, and the total number of occurrences of these groups is, on average, about 23% higher for solar plages than for sunspots. Concerning the N-S asymmetry, when the northern hemisphere becomes predominant, it dominates the other hemisphere for a longer time than the opposite case and shows a higher asymmetry. In addition, we found that the normalized N-S asymmetry index, δ, of solar activity in terms of the occurrence of sunspots and solar plage groups follows approximately the same behaviour regardless of the morphological type, but presents a slight dependence on their area, since sunspot and solar plage groups show higher values of the δ index, the larger their areas are. Furthermore, we noticed three highly significant extremes in the N-S asymmetry, located around the minima of the 14th, 15th and 16th solar cycles (1912 [S]; 1924 [N]; 1933 [N]). However, the general trend is not equal in both structures, since in contrast to sunspots, solar plage groups present lower values of asymmetry throughout practically all the period under consideration. These facts could be interpreted in terms of magnetic cancellation processes and/or merging of close-by faculae.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.14342/5414
https://doi.org/10.1007/s11207-020-01648-6
url http://hdl.handle.net/20.500.14342/5414
https://doi.org/10.1007/s11207-020-01648-6
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Solar Phys (2020) 295:99
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
© L'autor/a
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
© L'autor/a
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 40
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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