foF2 long-term trends at the southern crest of the equatorial anomaly

Autores
Elias, Ana Georgina; Ortiz de Adler, Nieves del Carmen
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Long-term trends in the electron density of the ionosphere for the period 1957-1986 is studied using foF2 monthly median hourly data measured at Tucuman (26.9S, 65.4W), a station located at the southern crest of the equatorial anomaly. The linear trend for each hour and each month is estimated after filtering out the effects of solar activity. For the intervals 0-2 LT and 9-23 LT, during equinoxes and summer solstice, the trend is negative. Statistically null or slightly positive trends are observed for the interval 3-8 LT for every season, and for every hour of winter months. The daily amplitude of foF2 decreases since 1957 due to the decreasing trend in the maximum daily values and almost null-trended minimum daily values. A rough estimate, based on the dip angle trend (which in Tucuman has increased during the 30-year interval at a rate of 0.35%/year), indicates that negative foF2 trends should be expected during daytime hours, and positive trends during night-time hours, behaviour observed in the foF2 data here analyzed.
Fil: Elias, Ana Georgina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
Fil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
Materia
Ionosphere
Long Term Trend
Fof2
Solar Activity
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:11336/83911
Acceder
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network_name_str CONICET Digital (CONICET)
spelling foF2 long-term trends at the southern crest of the equatorial anomalyElias, Ana GeorginaOrtiz de Adler, Nieves del CarmenIonosphereLong Term TrendFof2Solar Activityhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Long-term trends in the electron density of the ionosphere for the period 1957-1986 is studied using foF2 monthly median hourly data measured at Tucuman (26.9S, 65.4W), a station located at the southern crest of the equatorial anomaly. The linear trend for each hour and each month is estimated after filtering out the effects of solar activity. For the intervals 0-2 LT and 9-23 LT, during equinoxes and summer solstice, the trend is negative. Statistically null or slightly positive trends are observed for the interval 3-8 LT for every season, and for every hour of winter months. The daily amplitude of foF2 decreases since 1957 due to the decreasing trend in the maximum daily values and almost null-trended minimum daily values. A rough estimate, based on the dip angle trend (which in Tucuman has increased during the 30-year interval at a rate of 0.35%/year), indicates that negative foF2 trends should be expected during daytime hours, and positive trends during night-time hours, behaviour observed in the foF2 data here analyzed.Fil: Elias, Ana Georgina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; ArgentinaElsevier Ltd.2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/83911Elias, Ana Georgina; Ortiz de Adler, Nieves del Carmen; foF2 long-term trends at the southern crest of the equatorial anomaly; Elsevier Ltd.; Physics and Chemistry of the Earth; 31; 1-3; 12-2006; 63-671474-7065CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.pce.2005.02.004info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1474706506000118?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 Técnicas2025-09-29T10:21:18Zoai:ri.conicet.gov.ar:11336/83911instacron: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 10:21:18.253CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv foF2 long-term trends at the southern crest of the equatorial anomaly
title foF2 long-term trends at the southern crest of the equatorial anomaly
spellingShingle foF2 long-term trends at the southern crest of the equatorial anomaly
Elias, Ana Georgina
Ionosphere
Long Term Trend
Fof2
Solar Activity
title_short foF2 long-term trends at the southern crest of the equatorial anomaly
title_full foF2 long-term trends at the southern crest of the equatorial anomaly
title_fullStr foF2 long-term trends at the southern crest of the equatorial anomaly
title_full_unstemmed foF2 long-term trends at the southern crest of the equatorial anomaly
title_sort foF2 long-term trends at the southern crest of the equatorial anomaly
dc.creator.none.fl_str_mv Elias, Ana Georgina
Ortiz de Adler, Nieves del Carmen
author Elias, Ana Georgina
author_facet Elias, Ana Georgina
Ortiz de Adler, Nieves del Carmen
author_role author
author2 Ortiz de Adler, Nieves del Carmen
author2_role author
dc.subject.none.fl_str_mv Ionosphere
Long Term Trend
Fof2
Solar Activity
topic Ionosphere
Long Term Trend
Fof2
Solar Activity
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Long-term trends in the electron density of the ionosphere for the period 1957-1986 is studied using foF2 monthly median hourly data measured at Tucuman (26.9S, 65.4W), a station located at the southern crest of the equatorial anomaly. The linear trend for each hour and each month is estimated after filtering out the effects of solar activity. For the intervals 0-2 LT and 9-23 LT, during equinoxes and summer solstice, the trend is negative. Statistically null or slightly positive trends are observed for the interval 3-8 LT for every season, and for every hour of winter months. The daily amplitude of foF2 decreases since 1957 due to the decreasing trend in the maximum daily values and almost null-trended minimum daily values. A rough estimate, based on the dip angle trend (which in Tucuman has increased during the 30-year interval at a rate of 0.35%/year), indicates that negative foF2 trends should be expected during daytime hours, and positive trends during night-time hours, behaviour observed in the foF2 data here analyzed.
Fil: Elias, Ana Georgina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
Fil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
description Long-term trends in the electron density of the ionosphere for the period 1957-1986 is studied using foF2 monthly median hourly data measured at Tucuman (26.9S, 65.4W), a station located at the southern crest of the equatorial anomaly. The linear trend for each hour and each month is estimated after filtering out the effects of solar activity. For the intervals 0-2 LT and 9-23 LT, during equinoxes and summer solstice, the trend is negative. Statistically null or slightly positive trends are observed for the interval 3-8 LT for every season, and for every hour of winter months. The daily amplitude of foF2 decreases since 1957 due to the decreasing trend in the maximum daily values and almost null-trended minimum daily values. A rough estimate, based on the dip angle trend (which in Tucuman has increased during the 30-year interval at a rate of 0.35%/year), indicates that negative foF2 trends should be expected during daytime hours, and positive trends during night-time hours, behaviour observed in the foF2 data here analyzed.
publishDate 2006
dc.date.none.fl_str_mv 2006-12
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/11336/83911
Elias, Ana Georgina; Ortiz de Adler, Nieves del Carmen; foF2 long-term trends at the southern crest of the equatorial anomaly; Elsevier Ltd.; Physics and Chemistry of the Earth; 31; 1-3; 12-2006; 63-67
1474-7065
CONICET Digital
CONICET
url http://hdl.handle.net/11336/83911
identifier_str_mv Elias, Ana Georgina; Ortiz de Adler, Nieves del Carmen; foF2 long-term trends at the southern crest of the equatorial anomaly; Elsevier Ltd.; Physics and Chemistry of the Earth; 31; 1-3; 12-2006; 63-67
1474-7065
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.pce.2005.02.004
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1474706506000118?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
dc.publisher.none.fl_str_mv Elsevier Ltd.
publisher.none.fl_str_mv Elsevier Ltd.
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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