The nighttime anomalies using Global IGS VTEC Maps

Autores
Natali, Maria Paula; Meza, Amalia Margarita
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this paper we show the VTEC variations at night, considering their geomagnetic, seasonal and solar activity dependences. The variations are analyzed in two time periods 10 p.m. (pre-midnight) and 2 a.m. (post-midnight); and for two different solar conditions; one during high solar activity (2000) and the other during low solar activity (2008). Spatial and temporal ionosphere variability is investigated from Global IGS VTEC maps applying Principal Component Analysis (PCA). The IGS VTEC maps are reorganized and from each daily global dataset, two maps were constructed one at 10 p.m. and the other at 2 a.m. From these two series of VTEC maps covering periods low and high solar activity for each local time we found that: (1) The pre-midnight (10 p.m.) VTEC variability presents a strong semiannual anomaly at equatorial and low geomagnetic latitudes during high solar activity and in low solar activity an annual variation with maximum in summer at low-mid geomagnetic latitude. (2) The post-midnight (2 a.m) VTEC variability shows an annual variation at low and high solar activity, except in the equatorial region for high solar activity where a semiannual variation is recorded (the amplitude is twice lower than the amplitude at pre-midnight). The winter anomaly is present in the northern hemisphere in the American longitude sector and in the north-east of Africa; and a very small region in the south-west of Oceania.
Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Meza, Amalia Margarita. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Materia
Anomalies
Global Igs Vtec Maps
Night Winter Anomaly
Principal Component Analysis
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:11336/76860
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/76860
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The nighttime anomalies using Global IGS VTEC MapsNatali, Maria PaulaMeza, Amalia MargaritaAnomaliesGlobal Igs Vtec MapsNight Winter AnomalyPrincipal Component Analysishttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1In this paper we show the VTEC variations at night, considering their geomagnetic, seasonal and solar activity dependences. The variations are analyzed in two time periods 10 p.m. (pre-midnight) and 2 a.m. (post-midnight); and for two different solar conditions; one during high solar activity (2000) and the other during low solar activity (2008). Spatial and temporal ionosphere variability is investigated from Global IGS VTEC maps applying Principal Component Analysis (PCA). The IGS VTEC maps are reorganized and from each daily global dataset, two maps were constructed one at 10 p.m. and the other at 2 a.m. From these two series of VTEC maps covering periods low and high solar activity for each local time we found that: (1) The pre-midnight (10 p.m.) VTEC variability presents a strong semiannual anomaly at equatorial and low geomagnetic latitudes during high solar activity and in low solar activity an annual variation with maximum in summer at low-mid geomagnetic latitude. (2) The post-midnight (2 a.m) VTEC variability shows an annual variation at low and high solar activity, except in the equatorial region for high solar activity where a semiannual variation is recorded (the amplitude is twice lower than the amplitude at pre-midnight). The winter anomaly is present in the northern hemisphere in the American longitude sector and in the north-east of Africa; and a very small region in the south-west of Oceania.Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Meza, Amalia Margarita. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaElsevier2013-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/76860Natali, Maria Paula; Meza, Amalia Margarita; The nighttime anomalies using Global IGS VTEC Maps; Elsevier; Advances in Space Research; 51; 3; 2-2013; 377-3870273-1177CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.asr.2012.09.031info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0273117712006217?via%3Dihubinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:35:47Zoai:ri.conicet.gov.ar:11336/76860instacron: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 10:35:48.257CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The nighttime anomalies using Global IGS VTEC Maps
title The nighttime anomalies using Global IGS VTEC Maps
spellingShingle The nighttime anomalies using Global IGS VTEC Maps
Natali, Maria Paula
Anomalies
Global Igs Vtec Maps
Night Winter Anomaly
Principal Component Analysis
title_short The nighttime anomalies using Global IGS VTEC Maps
title_full The nighttime anomalies using Global IGS VTEC Maps
title_fullStr The nighttime anomalies using Global IGS VTEC Maps
title_full_unstemmed The nighttime anomalies using Global IGS VTEC Maps
title_sort The nighttime anomalies using Global IGS VTEC Maps
dc.creator.none.fl_str_mv Natali, Maria Paula
Meza, Amalia Margarita
author Natali, Maria Paula
author_facet Natali, Maria Paula
Meza, Amalia Margarita
author_role author
author2 Meza, Amalia Margarita
author2_role author
dc.subject.none.fl_str_mv Anomalies
Global Igs Vtec Maps
Night Winter Anomaly
Principal Component Analysis
topic Anomalies
Global Igs Vtec Maps
Night Winter Anomaly
Principal Component Analysis
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In this paper we show the VTEC variations at night, considering their geomagnetic, seasonal and solar activity dependences. The variations are analyzed in two time periods 10 p.m. (pre-midnight) and 2 a.m. (post-midnight); and for two different solar conditions; one during high solar activity (2000) and the other during low solar activity (2008). Spatial and temporal ionosphere variability is investigated from Global IGS VTEC maps applying Principal Component Analysis (PCA). The IGS VTEC maps are reorganized and from each daily global dataset, two maps were constructed one at 10 p.m. and the other at 2 a.m. From these two series of VTEC maps covering periods low and high solar activity for each local time we found that: (1) The pre-midnight (10 p.m.) VTEC variability presents a strong semiannual anomaly at equatorial and low geomagnetic latitudes during high solar activity and in low solar activity an annual variation with maximum in summer at low-mid geomagnetic latitude. (2) The post-midnight (2 a.m) VTEC variability shows an annual variation at low and high solar activity, except in the equatorial region for high solar activity where a semiannual variation is recorded (the amplitude is twice lower than the amplitude at pre-midnight). The winter anomaly is present in the northern hemisphere in the American longitude sector and in the north-east of Africa; and a very small region in the south-west of Oceania.
Fil: Natali, Maria Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Meza, Amalia Margarita. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
description In this paper we show the VTEC variations at night, considering their geomagnetic, seasonal and solar activity dependences. The variations are analyzed in two time periods 10 p.m. (pre-midnight) and 2 a.m. (post-midnight); and for two different solar conditions; one during high solar activity (2000) and the other during low solar activity (2008). Spatial and temporal ionosphere variability is investigated from Global IGS VTEC maps applying Principal Component Analysis (PCA). The IGS VTEC maps are reorganized and from each daily global dataset, two maps were constructed one at 10 p.m. and the other at 2 a.m. From these two series of VTEC maps covering periods low and high solar activity for each local time we found that: (1) The pre-midnight (10 p.m.) VTEC variability presents a strong semiannual anomaly at equatorial and low geomagnetic latitudes during high solar activity and in low solar activity an annual variation with maximum in summer at low-mid geomagnetic latitude. (2) The post-midnight (2 a.m) VTEC variability shows an annual variation at low and high solar activity, except in the equatorial region for high solar activity where a semiannual variation is recorded (the amplitude is twice lower than the amplitude at pre-midnight). The winter anomaly is present in the northern hemisphere in the American longitude sector and in the north-east of Africa; and a very small region in the south-west of Oceania.
publishDate 2013
dc.date.none.fl_str_mv 2013-02
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/11336/76860
Natali, Maria Paula; Meza, Amalia Margarita; The nighttime anomalies using Global IGS VTEC Maps; Elsevier; Advances in Space Research; 51; 3; 2-2013; 377-387
0273-1177
CONICET Digital
CONICET
url http://hdl.handle.net/11336/76860
identifier_str_mv Natali, Maria Paula; Meza, Amalia Margarita; The nighttime anomalies using Global IGS VTEC Maps; Elsevier; Advances in Space Research; 51; 3; 2-2013; 377-387
0273-1177
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.asr.2012.09.031
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0273117712006217?via%3Dihub
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
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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