Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station

Autores
Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Heredia, Teresita
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The trend of the peak height of the ionospheric F2 layer, hmF2, during three solar cycles (1957?1986) at Tucuman (26.9°S, 65.4°W), station located at the southern peak of the equatorial anomaly, has been estimated. hmF2 was calculated from M(3000), foE and foF2 records at 12 LT using Bilitza equation, which has been tested with real height values obtained from more than 200 rescaled ionograms. The anomalies, hmF2A, calculated as the deviation of experimental hmF2 values from that calculated assuming a linear dependence between hmF2 and the sunspot number, were estimated. The cumulated periodogram of hmF2A indicates a non-random behavior, within a 95% confidence level. After removing the effect of solar cycle variations and periodicities of less than 5 years, hmF2A shows a mean decrease of 0.2 km/yr (6 km in 30 years). A decrease of 14% in the maximum ionospheric electron density, NmF2, was also observed at the same station for the same period in a previous work of the authors. The lowering of hmF2 and NmF2 observed at Tucuman, are greater than that expected from the theory of a sinking of the upper atmosphere, due to a cooling in the thermosphere produced by the increase in CO2 concentration.
Fil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
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: Heredia, Teresita. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
Materia
LONG TERM TRENDS
F2 LAYER
IONOSPHERE
COOLING
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:11336/78372
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Long-term trend of the ionospheric F2 layer peak height at a southern low latitude stationOrtiz de Adler, Nieves del CarmenElias, Ana GeorginaHeredia, TeresitaLONG TERM TRENDSF2 LAYERIONOSPHERECOOLINGhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The trend of the peak height of the ionospheric F2 layer, hmF2, during three solar cycles (1957?1986) at Tucuman (26.9°S, 65.4°W), station located at the southern peak of the equatorial anomaly, has been estimated. hmF2 was calculated from M(3000), foE and foF2 records at 12 LT using Bilitza equation, which has been tested with real height values obtained from more than 200 rescaled ionograms. The anomalies, hmF2A, calculated as the deviation of experimental hmF2 values from that calculated assuming a linear dependence between hmF2 and the sunspot number, were estimated. The cumulated periodogram of hmF2A indicates a non-random behavior, within a 95% confidence level. After removing the effect of solar cycle variations and periodicities of less than 5 years, hmF2A shows a mean decrease of 0.2 km/yr (6 km in 30 years). A decrease of 14% in the maximum ionospheric electron density, NmF2, was also observed at the same station for the same period in a previous work of the authors. The lowering of hmF2 and NmF2 observed at Tucuman, are greater than that expected from the theory of a sinking of the upper atmosphere, due to a cooling in the thermosphere produced by the increase in CO2 concentration.Fil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; ArgentinaFil: 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: Heredia, Teresita. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; ArgentinaPergamon-Elsevier Science Ltd2002-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/78372Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Heredia, Teresita ; Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station; Pergamon-Elsevier Science Ltd; Physics and Chemistry of the Earth; 27; 6-8; 2-2002; 613-6151474-7065CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S147470650200044X/pdfft?md5=5072fe6c46c68cc42794f3da59797421&pid=1-s2.0-S147470650200044X-main.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.1016/S1474-7065(02)00044-Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:34:05Zoai:ri.conicet.gov.ar:11336/78372instacron: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 09:34:05.844CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
title Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
spellingShingle Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
Ortiz de Adler, Nieves del Carmen
LONG TERM TRENDS
F2 LAYER
IONOSPHERE
COOLING
title_short Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
title_full Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
title_fullStr Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
title_full_unstemmed Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
title_sort Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station
dc.creator.none.fl_str_mv Ortiz de Adler, Nieves del Carmen
Elias, Ana Georgina
Heredia, Teresita
author Ortiz de Adler, Nieves del Carmen
author_facet Ortiz de Adler, Nieves del Carmen
Elias, Ana Georgina
Heredia, Teresita
author_role author
author2 Elias, Ana Georgina
Heredia, Teresita
author2_role author
author
dc.subject.none.fl_str_mv LONG TERM TRENDS
F2 LAYER
IONOSPHERE
COOLING
topic LONG TERM TRENDS
F2 LAYER
IONOSPHERE
COOLING
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 trend of the peak height of the ionospheric F2 layer, hmF2, during three solar cycles (1957?1986) at Tucuman (26.9°S, 65.4°W), station located at the southern peak of the equatorial anomaly, has been estimated. hmF2 was calculated from M(3000), foE and foF2 records at 12 LT using Bilitza equation, which has been tested with real height values obtained from more than 200 rescaled ionograms. The anomalies, hmF2A, calculated as the deviation of experimental hmF2 values from that calculated assuming a linear dependence between hmF2 and the sunspot number, were estimated. The cumulated periodogram of hmF2A indicates a non-random behavior, within a 95% confidence level. After removing the effect of solar cycle variations and periodicities of less than 5 years, hmF2A shows a mean decrease of 0.2 km/yr (6 km in 30 years). A decrease of 14% in the maximum ionospheric electron density, NmF2, was also observed at the same station for the same period in a previous work of the authors. The lowering of hmF2 and NmF2 observed at Tucuman, are greater than that expected from the theory of a sinking of the upper atmosphere, due to a cooling in the thermosphere produced by the increase in CO2 concentration.
Fil: Ortiz de Adler, Nieves del Carmen. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
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: Heredia, Teresita. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina
description The trend of the peak height of the ionospheric F2 layer, hmF2, during three solar cycles (1957?1986) at Tucuman (26.9°S, 65.4°W), station located at the southern peak of the equatorial anomaly, has been estimated. hmF2 was calculated from M(3000), foE and foF2 records at 12 LT using Bilitza equation, which has been tested with real height values obtained from more than 200 rescaled ionograms. The anomalies, hmF2A, calculated as the deviation of experimental hmF2 values from that calculated assuming a linear dependence between hmF2 and the sunspot number, were estimated. The cumulated periodogram of hmF2A indicates a non-random behavior, within a 95% confidence level. After removing the effect of solar cycle variations and periodicities of less than 5 years, hmF2A shows a mean decrease of 0.2 km/yr (6 km in 30 years). A decrease of 14% in the maximum ionospheric electron density, NmF2, was also observed at the same station for the same period in a previous work of the authors. The lowering of hmF2 and NmF2 observed at Tucuman, are greater than that expected from the theory of a sinking of the upper atmosphere, due to a cooling in the thermosphere produced by the increase in CO2 concentration.
publishDate 2002
dc.date.none.fl_str_mv 2002-02
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/11336/78372
Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Heredia, Teresita ; Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station; Pergamon-Elsevier Science Ltd; Physics and Chemistry of the Earth; 27; 6-8; 2-2002; 613-615
1474-7065
CONICET Digital
CONICET
url http://hdl.handle.net/11336/78372
identifier_str_mv Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Heredia, Teresita ; Long-term trend of the ionospheric F2 layer peak height at a southern low latitude station; Pergamon-Elsevier Science Ltd; Physics and Chemistry of the Earth; 27; 6-8; 2-2002; 613-615
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/url/https://www.sciencedirect.com/science/article/pii/S147470650200044X/pdfft?md5=5072fe6c46c68cc42794f3da59797421&pid=1-s2.0-S147470650200044X-main.pdf
info:eu-repo/semantics/altIdentifier/doi/10.1016/S1474-7065(02)00044-X
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 Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science 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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