A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth

Autores
Azpilicueta, Francisco Javier; Brunini, Claudio Antonio
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The H component of the magnetic field measured at the terrestrial surface presents several periodic signals caused by changes in the ring current that flows within the terrestrial magnetosphere. One of the most important of them is associated to the phenomenon known as the Semiannual Anomaly which produces two significant minima during the equinoxes. This phenomenon is global, i.e., every observatory registers a similar effect independently of the hemisphere where it is located. A second important signal is due to the phenomenon known as the Annual Anomaly that produces significant different values for solstices, with a particular feature: the effect depends on the hemisphere where the observatory is located, with maximum during local summer. In spite of the time since their discoveries (more than a hundred years ago) the physical processes behind them are still open to discussion. In this work we present a new physical interpretation for the combined effects of both anomalies. The main concept developed is that along the year the shape of the magnetospheric cavities within which the ring current flows is deformed according to the geometric configuration between the solar wind and the magnetosphere.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Geofísica
Anomalies
Magnetospheric cavities
H component
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/95993

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spelling A different interpretation of the annual and semiannual anomalies on the magnetic activity over the EarthAzpilicueta, Francisco JavierBrunini, Claudio AntonioGeofísicaAnomaliesMagnetospheric cavitiesH componentThe H component of the magnetic field measured at the terrestrial surface presents several periodic signals caused by changes in the ring current that flows within the terrestrial magnetosphere. One of the most important of them is associated to the phenomenon known as the Semiannual Anomaly which produces two significant minima during the equinoxes. This phenomenon is global, i.e., every observatory registers a similar effect independently of the hemisphere where it is located. A second important signal is due to the phenomenon known as the Annual Anomaly that produces significant different values for solstices, with a particular feature: the effect depends on the hemisphere where the observatory is located, with maximum during local summer. In spite of the time since their discoveries (more than a hundred years ago) the physical processes behind them are still open to discussion. In this work we present a new physical interpretation for the combined effects of both anomalies. The main concept developed is that along the year the shape of the magnetospheric cavities within which the ring current flows is deformed according to the geometric configuration between the solar wind and the magnetosphere.Facultad de Ciencias Astronómicas y Geofísicas2012-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/95993enginfo:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/79549info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012JA017893info:eu-repo/semantics/altIdentifier/issn/2169-9402info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JA017893info:eu-repo/semantics/altIdentifier/hdl/11336/79549info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:20:25Zoai:sedici.unlp.edu.ar:10915/95993Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:20:26.179SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
title A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
spellingShingle A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
Azpilicueta, Francisco Javier
Geofísica
Anomalies
Magnetospheric cavities
H component
title_short A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
title_full A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
title_fullStr A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
title_full_unstemmed A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
title_sort A different interpretation of the annual and semiannual anomalies on the magnetic activity over the Earth
dc.creator.none.fl_str_mv Azpilicueta, Francisco Javier
Brunini, Claudio Antonio
author Azpilicueta, Francisco Javier
author_facet Azpilicueta, Francisco Javier
Brunini, Claudio Antonio
author_role author
author2 Brunini, Claudio Antonio
author2_role author
dc.subject.none.fl_str_mv Geofísica
Anomalies
Magnetospheric cavities
H component
topic Geofísica
Anomalies
Magnetospheric cavities
H component
dc.description.none.fl_txt_mv The H component of the magnetic field measured at the terrestrial surface presents several periodic signals caused by changes in the ring current that flows within the terrestrial magnetosphere. One of the most important of them is associated to the phenomenon known as the Semiannual Anomaly which produces two significant minima during the equinoxes. This phenomenon is global, i.e., every observatory registers a similar effect independently of the hemisphere where it is located. A second important signal is due to the phenomenon known as the Annual Anomaly that produces significant different values for solstices, with a particular feature: the effect depends on the hemisphere where the observatory is located, with maximum during local summer. In spite of the time since their discoveries (more than a hundred years ago) the physical processes behind them are still open to discussion. In this work we present a new physical interpretation for the combined effects of both anomalies. The main concept developed is that along the year the shape of the magnetospheric cavities within which the ring current flows is deformed according to the geometric configuration between the solar wind and the magnetosphere.
Facultad de Ciencias Astronómicas y Geofísicas
description The H component of the magnetic field measured at the terrestrial surface presents several periodic signals caused by changes in the ring current that flows within the terrestrial magnetosphere. One of the most important of them is associated to the phenomenon known as the Semiannual Anomaly which produces two significant minima during the equinoxes. This phenomenon is global, i.e., every observatory registers a similar effect independently of the hemisphere where it is located. A second important signal is due to the phenomenon known as the Annual Anomaly that produces significant different values for solstices, with a particular feature: the effect depends on the hemisphere where the observatory is located, with maximum during local summer. In spite of the time since their discoveries (more than a hundred years ago) the physical processes behind them are still open to discussion. In this work we present a new physical interpretation for the combined effects of both anomalies. The main concept developed is that along the year the shape of the magnetospheric cavities within which the ring current flows is deformed according to the geometric configuration between the solar wind and the magnetosphere.
publishDate 2012
dc.date.none.fl_str_mv 2012-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/95993
url http://sedici.unlp.edu.ar/handle/10915/95993
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/79549
info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012JA017893
info:eu-repo/semantics/altIdentifier/issn/2169-9402
info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JA017893
info:eu-repo/semantics/altIdentifier/hdl/11336/79549
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
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reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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