FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly

Autores
Pham Thi Thu, Hong; Amory Mazaudier, Christine; Le Huy, Minh; Elias, Ana Georgina
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Long-term trend of the critical frequency of the F2 ionospheric region, foF2, at Phu Thuy station (21.03°N, 105.96°E), Vietnam, located under the northern crest of the equatorial ionization anomaly, EIA, is studied. Annual mean data are analyzed at 04 LT and 12 LT for the period 1962–2002 using monthly median values and monthly mean values during magnetically quiet days (am < 20). In both cases we obtain similar trends at 4 LT and 12 LT, which we interpret as an absence of geomagnetic activity effect over trends. The positive trends obtained are not consistent with the negative values expected from greenhouse gases effect at this layer of the upper atmosphere. The increasing trend observed at 12 LT is qualitatively in agreement with the expected effect of the secular displacement of the dip equator over the EIA latitudinal profile. At 04 LT, when the EIA is absent, the positive trend is in qualitative agreement with the secular variation of the Earth's magnetic field inclination, I, and the consequent increase of the sin(I)cos(I) factor at the corresponding location.
Fil: Pham Thi Thu, Hong. Vietnamese Academy Of Science And Technology; Vietnam
Fil: Amory Mazaudier, Christine. Universite Pierre Et Marie Curie; Francia. The Abdus Salam. International Centre For Theoretical Physics; Italia. The Abdus Salam; Italia
Fil: Le Huy, Minh. Vietnamese Academy Of Science And Technology; Vietnam
Fil: Elias, Ana Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Tucumán; Argentina
Materia
EARTH'S MAGNETIC FIELD
EQUATORIAL IONIZATION ANOMALY
FOF2
IONOSPHERE
LONG-TERM TRENDS
SECULAR VARIATION
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:11336/17477
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomalyPham Thi Thu, HongAmory Mazaudier, ChristineLe Huy, MinhElias, Ana GeorginaEARTH'S MAGNETIC FIELDEQUATORIAL IONIZATION ANOMALYFOF2IONOSPHERELONG-TERM TRENDSSECULAR VARIATIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Long-term trend of the critical frequency of the F2 ionospheric region, foF2, at Phu Thuy station (21.03°N, 105.96°E), Vietnam, located under the northern crest of the equatorial ionization anomaly, EIA, is studied. Annual mean data are analyzed at 04 LT and 12 LT for the period 1962–2002 using monthly median values and monthly mean values during magnetically quiet days (am < 20). In both cases we obtain similar trends at 4 LT and 12 LT, which we interpret as an absence of geomagnetic activity effect over trends. The positive trends obtained are not consistent with the negative values expected from greenhouse gases effect at this layer of the upper atmosphere. The increasing trend observed at 12 LT is qualitatively in agreement with the expected effect of the secular displacement of the dip equator over the EIA latitudinal profile. At 04 LT, when the EIA is absent, the positive trend is in qualitative agreement with the secular variation of the Earth's magnetic field inclination, I, and the consequent increase of the sin(I)cos(I) factor at the corresponding location.Fil: Pham Thi Thu, Hong. Vietnamese Academy Of Science And Technology; VietnamFil: Amory Mazaudier, Christine. Universite Pierre Et Marie Curie; Francia. The Abdus Salam. International Centre For Theoretical Physics; Italia. The Abdus Salam; ItaliaFil: Le Huy, Minh. Vietnamese Academy Of Science And Technology; VietnamFil: Elias, Ana Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Tucumán; ArgentinaAmerican Geophysical Union2016-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/17477Pham Thi Thu, Hong; Amory Mazaudier, Christine; Le Huy, Minh; Elias, Ana Georgina; FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly; American Geophysical Union; Journal of Geophysical Research A: Space Physics; 121; 1; 1-2016; 719-7262169-9380enginfo:eu-repo/semantics/altIdentifier/doi/10.1002/2015JA021890info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/2015JA021890/abstract;jsessionid=1F67BCF7F1A0AC6D88E643829ABC2115.f02t04info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:01:12Zoai:ri.conicet.gov.ar:11336/17477instacron: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:34982025-09-10 13:01:13.103CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
title FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
spellingShingle FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
Pham Thi Thu, Hong
EARTH'S MAGNETIC FIELD
EQUATORIAL IONIZATION ANOMALY
FOF2
IONOSPHERE
LONG-TERM TRENDS
SECULAR VARIATION
title_short FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
title_full FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
title_fullStr FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
title_full_unstemmed FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
title_sort FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly
dc.creator.none.fl_str_mv Pham Thi Thu, Hong
Amory Mazaudier, Christine
Le Huy, Minh
Elias, Ana Georgina
author Pham Thi Thu, Hong
author_facet Pham Thi Thu, Hong
Amory Mazaudier, Christine
Le Huy, Minh
Elias, Ana Georgina
author_role author
author2 Amory Mazaudier, Christine
Le Huy, Minh
Elias, Ana Georgina
author2_role author
author
author
dc.subject.none.fl_str_mv EARTH'S MAGNETIC FIELD
EQUATORIAL IONIZATION ANOMALY
FOF2
IONOSPHERE
LONG-TERM TRENDS
SECULAR VARIATION
topic EARTH'S MAGNETIC FIELD
EQUATORIAL IONIZATION ANOMALY
FOF2
IONOSPHERE
LONG-TERM TRENDS
SECULAR VARIATION
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 trend of the critical frequency of the F2 ionospheric region, foF2, at Phu Thuy station (21.03°N, 105.96°E), Vietnam, located under the northern crest of the equatorial ionization anomaly, EIA, is studied. Annual mean data are analyzed at 04 LT and 12 LT for the period 1962–2002 using monthly median values and monthly mean values during magnetically quiet days (am < 20). In both cases we obtain similar trends at 4 LT and 12 LT, which we interpret as an absence of geomagnetic activity effect over trends. The positive trends obtained are not consistent with the negative values expected from greenhouse gases effect at this layer of the upper atmosphere. The increasing trend observed at 12 LT is qualitatively in agreement with the expected effect of the secular displacement of the dip equator over the EIA latitudinal profile. At 04 LT, when the EIA is absent, the positive trend is in qualitative agreement with the secular variation of the Earth's magnetic field inclination, I, and the consequent increase of the sin(I)cos(I) factor at the corresponding location.
Fil: Pham Thi Thu, Hong. Vietnamese Academy Of Science And Technology; Vietnam
Fil: Amory Mazaudier, Christine. Universite Pierre Et Marie Curie; Francia. The Abdus Salam. International Centre For Theoretical Physics; Italia. The Abdus Salam; Italia
Fil: Le Huy, Minh. Vietnamese Academy Of Science And Technology; Vietnam
Fil: Elias, Ana Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Tucumán; Argentina
description Long-term trend of the critical frequency of the F2 ionospheric region, foF2, at Phu Thuy station (21.03°N, 105.96°E), Vietnam, located under the northern crest of the equatorial ionization anomaly, EIA, is studied. Annual mean data are analyzed at 04 LT and 12 LT for the period 1962–2002 using monthly median values and monthly mean values during magnetically quiet days (am < 20). In both cases we obtain similar trends at 4 LT and 12 LT, which we interpret as an absence of geomagnetic activity effect over trends. The positive trends obtained are not consistent with the negative values expected from greenhouse gases effect at this layer of the upper atmosphere. The increasing trend observed at 12 LT is qualitatively in agreement with the expected effect of the secular displacement of the dip equator over the EIA latitudinal profile. At 04 LT, when the EIA is absent, the positive trend is in qualitative agreement with the secular variation of the Earth's magnetic field inclination, I, and the consequent increase of the sin(I)cos(I) factor at the corresponding location.
publishDate 2016
dc.date.none.fl_str_mv 2016-01
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/11336/17477
Pham Thi Thu, Hong; Amory Mazaudier, Christine; Le Huy, Minh; Elias, Ana Georgina; FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly; American Geophysical Union; Journal of Geophysical Research A: Space Physics; 121; 1; 1-2016; 719-726
2169-9380
url http://hdl.handle.net/11336/17477
identifier_str_mv Pham Thi Thu, Hong; Amory Mazaudier, Christine; Le Huy, Minh; Elias, Ana Georgina; FoF2 long-term trend linked to Earth's magnetic field secular variation at a station under the northern crest of the equatorial ionization anomaly; American Geophysical Union; Journal of Geophysical Research A: Space Physics; 121; 1; 1-2016; 719-726
2169-9380
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1002/2015JA021890
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/2015JA021890/abstract;jsessionid=1F67BCF7F1A0AC6D88E643829ABC2115.f02t04
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
_version_ 1842979933324836864
score 12.48226

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