Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes

Autores
Natali, Maria Paula
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The aim of this work is the analysis of the annual, semiannual, and seasonal effects in the total electron content (TEC) of the terrestrial atmosphere during low solar activity. Spatial and temporal ionospheric variability are investigated from global International Global Navigation Satellite System Service (IGS) VTEC maps during low solar activity in 2006. Two different techniques, principal component analysis (PCA) and Fourier analysis, are applied to the data set. Applying the PCA technique on a time series of global IGS VTEC maps gives us a method to analyze the main ionospheric anomalies on a global scale. The Fourier series provide us a comparison with the results obtained with PCA. The behavior of VTEC variations at 2 h periods centered at 1200 and 2200 local time (LT) are analyzed. Particular characteristics associated with each period and with the geomagnetic region are highlighted. All the stations show an annual behavior, which means that the maxima variations of the VTEC occur in summer while minimum variations are in winter, except in the stations located at the Northern Hemisphere at noon. Some regions show patterns of the semiannual anomaly during local noon, and it is also possible to see a higher peak of VTEC during spring rather than autumn in the Northern Hemisphere. However, if we analyze the pattern in the Southern Hemisphere, both peaks in equinox are of the same magnitude. Results obtained with Fourier series are comparable with the ones mentioned above.
Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Principal Component Analysis
Global IGS Vtec maps
anomalies
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/241678
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudesNatali, Maria PaulaPrincipal Component AnalysisGlobal IGS Vtec mapsanomalieshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The aim of this work is the analysis of the annual, semiannual, and seasonal effects in the total electron content (TEC) of the terrestrial atmosphere during low solar activity. Spatial and temporal ionospheric variability are investigated from global International Global Navigation Satellite System Service (IGS) VTEC maps during low solar activity in 2006. Two different techniques, principal component analysis (PCA) and Fourier analysis, are applied to the data set. Applying the PCA technique on a time series of global IGS VTEC maps gives us a method to analyze the main ionospheric anomalies on a global scale. The Fourier series provide us a comparison with the results obtained with PCA. The behavior of VTEC variations at 2 h periods centered at 1200 and 2200 local time (LT) are analyzed. Particular characteristics associated with each period and with the geomagnetic region are highlighted. All the stations show an annual behavior, which means that the maxima variations of the VTEC occur in summer while minimum variations are in winter, except in the stations located at the Northern Hemisphere at noon. Some regions show patterns of the semiannual anomaly during local noon, and it is also possible to see a higher peak of VTEC during spring rather than autumn in the Northern Hemisphere. However, if we analyze the pattern in the Southern Hemisphere, both peaks in equinox are of the same magnitude. Results obtained with Fourier series are comparable with the ones mentioned above.Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaAmerican Geophysical Union2010-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241678Natali, Maria Paula; Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes; American Geophysical Union; Journal of Geophysical Research; 115; D18; 9-2010; 1-120148-0227CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1029/2010JD014267info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2010JD014267info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:05:49Zoai:ri.conicet.gov.ar:11336/241678instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:05:49.898CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
title Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
spellingShingle Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
Natali, Maria Paula
Principal Component Analysis
Global IGS Vtec maps
anomalies
title_short Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
title_full Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
title_fullStr Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
title_full_unstemmed Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
title_sort Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes
dc.creator.none.fl_str_mv Natali, Maria Paula
author Natali, Maria Paula
author_facet Natali, Maria Paula
author_role author
dc.subject.none.fl_str_mv Principal Component Analysis
Global IGS Vtec maps
anomalies
topic Principal Component Analysis
Global IGS Vtec maps
anomalies
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The aim of this work is the analysis of the annual, semiannual, and seasonal effects in the total electron content (TEC) of the terrestrial atmosphere during low solar activity. Spatial and temporal ionospheric variability are investigated from global International Global Navigation Satellite System Service (IGS) VTEC maps during low solar activity in 2006. Two different techniques, principal component analysis (PCA) and Fourier analysis, are applied to the data set. Applying the PCA technique on a time series of global IGS VTEC maps gives us a method to analyze the main ionospheric anomalies on a global scale. The Fourier series provide us a comparison with the results obtained with PCA. The behavior of VTEC variations at 2 h periods centered at 1200 and 2200 local time (LT) are analyzed. Particular characteristics associated with each period and with the geomagnetic region are highlighted. All the stations show an annual behavior, which means that the maxima variations of the VTEC occur in summer while minimum variations are in winter, except in the stations located at the Northern Hemisphere at noon. Some regions show patterns of the semiannual anomaly during local noon, and it is also possible to see a higher peak of VTEC during spring rather than autumn in the Northern Hemisphere. However, if we analyze the pattern in the Southern Hemisphere, both peaks in equinox are of the same magnitude. Results obtained with Fourier series are comparable with the ones mentioned above.
Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description The aim of this work is the analysis of the annual, semiannual, and seasonal effects in the total electron content (TEC) of the terrestrial atmosphere during low solar activity. Spatial and temporal ionospheric variability are investigated from global International Global Navigation Satellite System Service (IGS) VTEC maps during low solar activity in 2006. Two different techniques, principal component analysis (PCA) and Fourier analysis, are applied to the data set. Applying the PCA technique on a time series of global IGS VTEC maps gives us a method to analyze the main ionospheric anomalies on a global scale. The Fourier series provide us a comparison with the results obtained with PCA. The behavior of VTEC variations at 2 h periods centered at 1200 and 2200 local time (LT) are analyzed. Particular characteristics associated with each period and with the geomagnetic region are highlighted. All the stations show an annual behavior, which means that the maxima variations of the VTEC occur in summer while minimum variations are in winter, except in the stations located at the Northern Hemisphere at noon. Some regions show patterns of the semiannual anomaly during local noon, and it is also possible to see a higher peak of VTEC during spring rather than autumn in the Northern Hemisphere. However, if we analyze the pattern in the Southern Hemisphere, both peaks in equinox are of the same magnitude. Results obtained with Fourier series are comparable with the ones mentioned above.
publishDate 2010
dc.date.none.fl_str_mv 2010-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/241678
Natali, Maria Paula; Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes; American Geophysical Union; Journal of Geophysical Research; 115; D18; 9-2010; 1-12
0148-0227
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241678
identifier_str_mv Natali, Maria Paula; Annual and semiannual VTEC effects at low solar activity based on GPS observations at different geomagnetic latitudes; American Geophysical Union; Journal of Geophysical Research; 115; D18; 9-2010; 1-12
0148-0227
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JD014267
info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2010JD014267
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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