The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters
- Autores
- Azpilicueta, Francisco Javier; Brunini, Claudio Antonio; Camilion, Emilio
- Año de publicación
- 2012
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The semiannual anomaly (also known as semiannual variation) on the magnetic activity is a phenomenon that produces clear minima during March and September and maxima in June and December on the horizontal components of the geomagnetic field. This phenomenon has been known since the middle of the nineteenth century, but in spite of the accumulation of measurements and the development of three theoretical models, a conclusive physical explanation for it has not been developed. The usual approach to study the semiannual anomaly is by means of geomagnetic indices like the disturbance storm time, Dst, which is based on combining measurements registered on four magnetic observatories. This work follows a different approach based on the raw horizontal components registered at the four observatories. The analyses performed aimed to study and assess the impact of several external parameters, characteristics of the Sun-Earth environment, on the semiannual anomaly. The influence of the global geomagnetic activity level, the solar activity level, the solar magnetic polarity, and the rising/declining phase of the solar radiation cycle is analyzed in detail. The most important finding is that the semiannual anomaly is always present and that none of the previously mentioned parameters significantly favor the development of it. A second result is the presence of a 27 day signal superposed to the semiannual anomaly which is significantly affected by the solar activity level.
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Astronomía
Ionosphere
Semiannual anomaly
Dst index
Geomagnetic activity
Geomagnetic semiannual anomaly
Geomagnetic semiannual variation - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/97581
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The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parametersAzpilicueta, Francisco JavierBrunini, Claudio AntonioCamilion, EmilioAstronomíaIonosphereSemiannual anomalyDst indexGeomagnetic activityGeomagnetic semiannual anomalyGeomagnetic semiannual variationThe semiannual anomaly (also known as semiannual variation) on the magnetic activity is a phenomenon that produces clear minima during March and September and maxima in June and December on the horizontal components of the geomagnetic field. This phenomenon has been known since the middle of the nineteenth century, but in spite of the accumulation of measurements and the development of three theoretical models, a conclusive physical explanation for it has not been developed. The usual approach to study the semiannual anomaly is by means of geomagnetic indices like the disturbance storm time, <i>Dst</i>, which is based on combining measurements registered on four magnetic observatories. This work follows a different approach based on the raw horizontal components registered at the four observatories. The analyses performed aimed to study and assess the impact of several external parameters, characteristics of the Sun-Earth environment, on the semiannual anomaly. The influence of the global geomagnetic activity level, the solar activity level, the solar magnetic polarity, and the rising/declining phase of the solar radiation cycle is analyzed in detail. The most important finding is that the semiannual anomaly is always present and that none of the previously mentioned parameters significantly favor the development of it. A second result is the presence of a 27 day signal superposed to the semiannual anomaly which is significantly affected by the solar activity level.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/10915/97581enginfo:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/11336/94996info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012JA017730info:eu-repo/semantics/altIdentifier/issn/0148-0227info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JA017730info:eu-repo/semantics/altIdentifier/hdl/11336/94996info: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:UNLP2025-09-29T11:20:16Zoai:sedici.unlp.edu.ar:10915/97581Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:20:16.939SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
title |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
spellingShingle |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters Azpilicueta, Francisco Javier Astronomía Ionosphere Semiannual anomaly Dst index Geomagnetic activity Geomagnetic semiannual anomaly Geomagnetic semiannual variation |
title_short |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
title_full |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
title_fullStr |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
title_full_unstemmed |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
title_sort |
The geomagnetic semiannual anomaly on the four <i>Dst</i>-fundamental observatories: Dependences with Sun-Earth physical parameters |
dc.creator.none.fl_str_mv |
Azpilicueta, Francisco Javier Brunini, Claudio Antonio Camilion, Emilio |
author |
Azpilicueta, Francisco Javier |
author_facet |
Azpilicueta, Francisco Javier Brunini, Claudio Antonio Camilion, Emilio |
author_role |
author |
author2 |
Brunini, Claudio Antonio Camilion, Emilio |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Astronomía Ionosphere Semiannual anomaly Dst index Geomagnetic activity Geomagnetic semiannual anomaly Geomagnetic semiannual variation |
topic |
Astronomía Ionosphere Semiannual anomaly Dst index Geomagnetic activity Geomagnetic semiannual anomaly Geomagnetic semiannual variation |
dc.description.none.fl_txt_mv |
The semiannual anomaly (also known as semiannual variation) on the magnetic activity is a phenomenon that produces clear minima during March and September and maxima in June and December on the horizontal components of the geomagnetic field. This phenomenon has been known since the middle of the nineteenth century, but in spite of the accumulation of measurements and the development of three theoretical models, a conclusive physical explanation for it has not been developed. The usual approach to study the semiannual anomaly is by means of geomagnetic indices like the disturbance storm time, <i>Dst</i>, which is based on combining measurements registered on four magnetic observatories. This work follows a different approach based on the raw horizontal components registered at the four observatories. The analyses performed aimed to study and assess the impact of several external parameters, characteristics of the Sun-Earth environment, on the semiannual anomaly. The influence of the global geomagnetic activity level, the solar activity level, the solar magnetic polarity, and the rising/declining phase of the solar radiation cycle is analyzed in detail. The most important finding is that the semiannual anomaly is always present and that none of the previously mentioned parameters significantly favor the development of it. A second result is the presence of a 27 day signal superposed to the semiannual anomaly which is significantly affected by the solar activity level. Facultad de Ciencias Astronómicas y Geofísicas |
description |
The semiannual anomaly (also known as semiannual variation) on the magnetic activity is a phenomenon that produces clear minima during March and September and maxima in June and December on the horizontal components of the geomagnetic field. This phenomenon has been known since the middle of the nineteenth century, but in spite of the accumulation of measurements and the development of three theoretical models, a conclusive physical explanation for it has not been developed. The usual approach to study the semiannual anomaly is by means of geomagnetic indices like the disturbance storm time, <i>Dst</i>, which is based on combining measurements registered on four magnetic observatories. This work follows a different approach based on the raw horizontal components registered at the four observatories. The analyses performed aimed to study and assess the impact of several external parameters, characteristics of the Sun-Earth environment, on the semiannual anomaly. The influence of the global geomagnetic activity level, the solar activity level, the solar magnetic polarity, and the rising/declining phase of the solar radiation cycle is analyzed in detail. The most important finding is that the semiannual anomaly is always present and that none of the previously mentioned parameters significantly favor the development of it. A second result is the presence of a 27 day signal superposed to the semiannual anomaly which is significantly affected by the solar activity level. |
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/10915/97581 |
url |
http://sedici.unlp.edu.ar/handle/10915/97581 |
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/11336/94996 info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012JA017730 info:eu-repo/semantics/altIdentifier/issn/0148-0227 info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JA017730 info:eu-repo/semantics/altIdentifier/hdl/11336/94996 |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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