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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/80259
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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 |
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1844614393262768128 |
score |
13.070432 |