Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses

Pc5 ULF (ultra-low frequency) waves can energize electrons to relativistic energies of > 2 MeV in geostationary orbits. Enhanced fluxes of such electrons can induce operational anomalies in geostationary satellites. The variations of the two quantities in timescales ranging from days to solar cyc...

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Autores: Poblet, Facundo Leandro, Azpilicueta, Francisco Javier, Lam, Hing Lan
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2020
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/173603
Acceso en línea:http://hdl.handle.net/11336/173603
Access Level:acceso abierto
Palabra clave:Semiannual Variation
Relativistic Electrons
Pc5 ULF waves
GOES fluence
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
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network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
title Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
spellingShingle Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
Poblet, Facundo Leandro
Semiannual Variation
Relativistic Electrons
Pc5 ULF waves
GOES fluence
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
title_full Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
title_fullStr Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
title_full_unstemmed Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
title_sort Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses
dc.creator.none.fl_str_mv Poblet, Facundo Leandro
Azpilicueta, Francisco Javier
Lam, Hing Lan
author Poblet, Facundo Leandro
author_facet Poblet, Facundo Leandro
Azpilicueta, Francisco Javier
Lam, Hing Lan
author_role author
author2 Azpilicueta, Francisco Javier
Lam, Hing Lan
author2_role author
author
dc.subject.none.fl_str_mv Semiannual Variation
Relativistic Electrons
Pc5 ULF waves
GOES fluence
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic Semiannual Variation
Relativistic Electrons
Pc5 ULF waves
GOES fluence
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description Pc5 ULF (ultra-low frequency) waves can energize electrons to relativistic energies of > 2 MeV in geostationary orbits. Enhanced fluxes of such electrons can induce operational anomalies in geostationary satellites. The variations of the two quantities in timescales ranging from days to solar cycles are thus of interest in gauging their space weather effects over different time frames. In this study, we present a statistical analysis of two 11-year solar cycles (cycles 22 and 23) of data comprising the daily relativistic electron fluence observed by Geostationary Environment Satellites (GOESs) and daily Pc5 ULF wave power derived from auroral zone magnetic observatories in Canada. First, an autocorrelation analysis is carried out, which indicates a 27 d periodicity in both parameters for all solar phases, and such a periodicity is most pronounced in the declining and late declining phase. Also, a 9 and 13 d periodicity are seen in some years. Then, a superposed epoch analysis is performed to scrutinize semiannual variation (SAV), which shows that fluence near the equinoxes is 1 order of magnitude higher than near solstices, and Pc5 ULF wave power is 0.5 orders of magnitude higher near the equinoxes than near the solstices. We then evaluate three possible SAV mechanisms (which are based on the axial, equinoctial, and Russell and McPherron effect) to determine which one can best explain the observations. Correlation of the profiles of the observational curves with those of the angles that control each of the SAV mechanisms suggests that the equinoctial mechanism may be responsible for the SAV of electron fluence, while both the equinoctial and the Russell and McPherron mechanisms are important for the SAV of Pc5 ULF wave power. Comparable results are obtained when using functional dependencies of the main angles instead of the angles mentioned above. Lastly, superposed curves of fluence and Pc5 ULF wave power were used to calculate least-square fits with a fixed semiannual period. Comparison of the maxima and minima of the fits with those predicted by the three mechanisms shows that the equinoctial effect better estimates the maxima and minima of the SAV in fluence while for the SAV in Pc5 ULF wave power the equinoctial and Russell and McPherron mechanisms predict one maximum and one minimum each.
publishDate 2020
dc.date.none.fl_str_mv 2020-09
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/11336/173603
Poblet, Facundo Leandro; Azpilicueta, Francisco Javier; Lam, Hing Lan; Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses; Copernicus Publications; Annales Geophysicae; 38; 5; 9-2020; 953-968
0992-7689
1432-0576
CONICET Digital
CONICET
url http://hdl.handle.net/11336/173603
identifier_str_mv Poblet, Facundo Leandro; Azpilicueta, Francisco Javier; Lam, Hing Lan; Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses; Copernicus Publications; Annales Geophysicae; 38; 5; 9-2020; 953-968
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/doi/10.5194/angeo-38-953-2020
info:eu-repo/semantics/altIdentifier/url/https://angeo.copernicus.org/articles/38/953/2020/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/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
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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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spelling Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypothesesPoblet, Facundo LeandroAzpilicueta, Francisco JavierLam, Hing LanSemiannual VariationRelativistic ElectronsPc5 ULF wavesGOES fluencehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Pc5 ULF (ultra-low frequency) waves can energize electrons to relativistic energies of > 2 MeV in geostationary orbits. Enhanced fluxes of such electrons can induce operational anomalies in geostationary satellites. The variations of the two quantities in timescales ranging from days to solar cycles are thus of interest in gauging their space weather effects over different time frames. In this study, we present a statistical analysis of two 11-year solar cycles (cycles 22 and 23) of data comprising the daily relativistic electron fluence observed by Geostationary Environment Satellites (GOESs) and daily Pc5 ULF wave power derived from auroral zone magnetic observatories in Canada. First, an autocorrelation analysis is carried out, which indicates a 27 d periodicity in both parameters for all solar phases, and such a periodicity is most pronounced in the declining and late declining phase. Also, a 9 and 13 d periodicity are seen in some years. Then, a superposed epoch analysis is performed to scrutinize semiannual variation (SAV), which shows that fluence near the equinoxes is 1 order of magnitude higher than near solstices, and Pc5 ULF wave power is 0.5 orders of magnitude higher near the equinoxes than near the solstices. We then evaluate three possible SAV mechanisms (which are based on the axial, equinoctial, and Russell and McPherron effect) to determine which one can best explain the observations. Correlation of the profiles of the observational curves with those of the angles that control each of the SAV mechanisms suggests that the equinoctial mechanism may be responsible for the SAV of electron fluence, while both the equinoctial and the Russell and McPherron mechanisms are important for the SAV of Pc5 ULF wave power. Comparable results are obtained when using functional dependencies of the main angles instead of the angles mentioned above. Lastly, superposed curves of fluence and Pc5 ULF wave power were used to calculate least-square fits with a fixed semiannual period. Comparison of the maxima and minima of the fits with those predicted by the three mechanisms shows that the equinoctial effect better estimates the maxima and minima of the SAV in fluence while for the SAV in Pc5 ULF wave power the equinoctial and Russell and McPherron mechanisms predict one maximum and one minimum each.Fil: Poblet, Facundo Leandro. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Azpilicueta, Francisco Javier. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Lam, Hing Lan. Natural Resources Canada; CanadáCopernicus Publications2020-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/173603Poblet, Facundo Leandro; Azpilicueta, Francisco Javier; Lam, Hing Lan; Semiannual variation of pc5 ultra-low frequency (ulf) waves and relativistic electrons over two solar cycles of observations: Comparison with predictions of the classical hypotheses; Copernicus Publications; Annales Geophysicae; 38; 5; 9-2020; 953-9680992-76891432-0576CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.5194/angeo-38-953-2020info:eu-repo/semantics/altIdentifier/url/https://angeo.copernicus.org/articles/38/953/2020/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:02:07Zoai:ri.conicet.gov.ar:11336/173603instacron: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:34982024-05-08 14:02:07.422CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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