Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends

Autores
Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given , the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25-30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles. F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given Rz, the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25?30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles.
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
Materia
Ionosphere
Solar Activity Cycle
Fof2
Hysteresis
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:11336/80259

id CONICETDig_627f7f7ad44aee2103766483268a39ef
oai_identifier_str oai:ri.conicet.gov.ar:11336/80259
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trendsOrtiz de Adler, Nieves del CarmenElias, Ana GeorginaIonosphereSolar Activity CycleFof2Hysteresishttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given , the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25-30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles. F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given Rz, the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25?30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles.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; ArgentinaCopernicus Publications2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/80259Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends; Copernicus Publications; Annales Geophysicae; 26; 5; 12-2008; 1269-12730992-76891432-0576CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.ann-geophys.net/26/1269/2008/angeo-26-1269-2008.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.5194/angeo-26-1269-2008info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:37:19Zoai:ri.conicet.gov.ar:11336/80259instacron: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 10:37:20.176CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
title Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
spellingShingle Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
Ortiz de Adler, Nieves del Carmen
Ionosphere
Solar Activity Cycle
Fof2
Hysteresis
title_short Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
title_full Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
title_fullStr Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
title_full_unstemmed Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
title_sort Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends
dc.creator.none.fl_str_mv Ortiz de Adler, Nieves del Carmen
Elias, Ana Georgina
author Ortiz de Adler, Nieves del Carmen
author_facet Ortiz de Adler, Nieves del Carmen
Elias, Ana Georgina
author_role author
author2 Elias, Ana Georgina
author2_role author
dc.subject.none.fl_str_mv Ionosphere
Solar Activity Cycle
Fof2
Hysteresis
topic Ionosphere
Solar Activity Cycle
Fof2
Hysteresis
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given , the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25-30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles. F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given Rz, the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25?30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles.
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
description F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given , the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25-30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles. F2 monthly median values for equinoctial months of solar cycles 20, 21 and 22, were analyzed for 37 worldwide stations. For each solar cycle and for a given Rz, the difference between F2 in the falling branch of the cycle and the corresponding value of the rising branch is evaluated. The maximum difference, considered as the hysteresis magnitude, varies systematically with geomagnetic latitude. The pattern is similar for every cycle, with greater hysteresis magnitudes for stronger solar cycles. It is positive between 45S and 45N, with minimum values at equatorial latitudes and maximum at around 25?30 on either side of the equator. For latitudes greater than 50 negative values are observed. At around 25?30 and at high latitudes the hysteresis magnitude reaches 2MHz for solar cycle with high activity levels, which represents around 20% of F2. The effects of F2 hysteresis on the analysis of long-term data sequences is analyzed. In the case of long-term trend analysis, the hysteresis behavior may induce spurious trends as a consequence of the filtering processes applied to F2 time series previous to trend values estimation. This problem may be solved by considering time series covering several solar cycles.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
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/11336/80259
Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends; Copernicus Publications; Annales Geophysicae; 26; 5; 12-2008; 1269-1273
0992-7689
1432-0576
CONICET Digital
CONICET
url http://hdl.handle.net/11336/80259
identifier_str_mv Ortiz de Adler, Nieves del Carmen; Elias, Ana Georgina; Latitudinal variation of foF2 hysteresis of solar cycles 20, 21 and 22 and its application to the analysis of long-term trends; Copernicus Publications; Annales Geophysicae; 26; 5; 12-2008; 1269-1273
0992-7689
1432-0576
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.ann-geophys.net/26/1269/2008/angeo-26-1269-2008.html
info:eu-repo/semantics/altIdentifier/doi/10.5194/angeo-26-1269-2008
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 Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
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_ 1844614393262768128
score 13.070432