An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI

Autores
Brunini, Claudio Antonio; Azpilicueta, Francisco Javier; Janches, Diego
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this work we explore the possibility of using COSMIC/FORMOSAT-3 radio occultation profiles (ROP) to establish a statistical model of the deviations that can be expected between the monthly median values of NmF2 and hmF2 computed with the International Reference Ionosphere (IRI) and the actual values of these parameters. The actual values are retrieved from the ROP after an interactively re-weighted Least Square fit that, complemented with a statistical test, allows filtering of unreliable data and estimating the errors of the retrieved values. The differences between the retrieved values and the monthly median values computed from IRI are interpreted as the superposition of a systematic bias (attributed to both, IRI and ROP), random errors in ROP, and the day-to-day variability, which is unaccounted for by IRI. This variability is described with a five-dimensional function that depends on: the month, the solar activity, the geomagnetic conditions, the modip latitude, and the local time. Empirical values of this function are estimated in the form of regular grids. Since this research is restricted to low solar activity and quiet geomagnetic conditions, the grid is reduced from five to three dimensions: month, local time, and modip (modified dip latitude). We found that the standard deviation of the day-to-day variability varies according to (in percent of the monthly median value computed with IRI): (i) NmF2 at noontime: ±10% to ±30% with maxima over the northern and southern peaks of the Equatorial Anomaly; (ii) NmF2 at midnight: ±20% to ±45%, with the greatest values in the equatorial region during the months of May and September; (iii) hmF2 at noontime: ±2% to ±10% with minima over the modip equator; and (iv) hmF2 at midnight: ±3% to ±11% with the greatest values in the equatorial region from January to May and from September to January.
Fil: Brunini, Claudio Antonio. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Azpilicueta, Francisco Javier. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Janches, Diego. Nasa Goddard Space Flight Center; Estados Unidos
Materia
Ionosphere
Iri
Nmf2 And Hmf2 Variability
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:11336/17968

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spelling An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRIBrunini, Claudio AntonioAzpilicueta, Francisco JavierJanches, DiegoIonosphereIriNmf2 And Hmf2 Variabilityhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1In this work we explore the possibility of using COSMIC/FORMOSAT-3 radio occultation profiles (ROP) to establish a statistical model of the deviations that can be expected between the monthly median values of NmF2 and hmF2 computed with the International Reference Ionosphere (IRI) and the actual values of these parameters. The actual values are retrieved from the ROP after an interactively re-weighted Least Square fit that, complemented with a statistical test, allows filtering of unreliable data and estimating the errors of the retrieved values. The differences between the retrieved values and the monthly median values computed from IRI are interpreted as the superposition of a systematic bias (attributed to both, IRI and ROP), random errors in ROP, and the day-to-day variability, which is unaccounted for by IRI. This variability is described with a five-dimensional function that depends on: the month, the solar activity, the geomagnetic conditions, the modip latitude, and the local time. Empirical values of this function are estimated in the form of regular grids. Since this research is restricted to low solar activity and quiet geomagnetic conditions, the grid is reduced from five to three dimensions: month, local time, and modip (modified dip latitude). We found that the standard deviation of the day-to-day variability varies according to (in percent of the monthly median value computed with IRI): (i) NmF2 at noontime: ±10% to ±30% with maxima over the northern and southern peaks of the Equatorial Anomaly; (ii) NmF2 at midnight: ±20% to ±45%, with the greatest values in the equatorial region during the months of May and September; (iii) hmF2 at noontime: ±2% to ±10% with minima over the modip equator; and (iv) hmF2 at midnight: ±3% to ±11% with the greatest values in the equatorial region from January to May and from September to January.Fil: Brunini, Claudio Antonio. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Azpilicueta, Francisco Javier. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Janches, Diego. Nasa Goddard Space Flight Center; Estados UnidosElsevier2015-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/17968Brunini, Claudio Antonio; Azpilicueta, Francisco Javier; Janches, Diego; An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI; Elsevier; Advances In Space Research; 55; 8; 4-2015; 2033-20400273-1177enginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0273117714004797info:eu-repo/semantics/altIdentifier/doi/10.1016/j.asr.2014.07.023info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:50:29Zoai:ri.conicet.gov.ar:11336/17968instacron: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 09:50:29.355CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
title An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
spellingShingle An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
Brunini, Claudio Antonio
Ionosphere
Iri
Nmf2 And Hmf2 Variability
title_short An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
title_full An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
title_fullStr An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
title_full_unstemmed An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
title_sort An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI
dc.creator.none.fl_str_mv Brunini, Claudio Antonio
Azpilicueta, Francisco Javier
Janches, Diego
author Brunini, Claudio Antonio
author_facet Brunini, Claudio Antonio
Azpilicueta, Francisco Javier
Janches, Diego
author_role author
author2 Azpilicueta, Francisco Javier
Janches, Diego
author2_role author
author
dc.subject.none.fl_str_mv Ionosphere
Iri
Nmf2 And Hmf2 Variability
topic Ionosphere
Iri
Nmf2 And Hmf2 Variability
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In this work we explore the possibility of using COSMIC/FORMOSAT-3 radio occultation profiles (ROP) to establish a statistical model of the deviations that can be expected between the monthly median values of NmF2 and hmF2 computed with the International Reference Ionosphere (IRI) and the actual values of these parameters. The actual values are retrieved from the ROP after an interactively re-weighted Least Square fit that, complemented with a statistical test, allows filtering of unreliable data and estimating the errors of the retrieved values. The differences between the retrieved values and the monthly median values computed from IRI are interpreted as the superposition of a systematic bias (attributed to both, IRI and ROP), random errors in ROP, and the day-to-day variability, which is unaccounted for by IRI. This variability is described with a five-dimensional function that depends on: the month, the solar activity, the geomagnetic conditions, the modip latitude, and the local time. Empirical values of this function are estimated in the form of regular grids. Since this research is restricted to low solar activity and quiet geomagnetic conditions, the grid is reduced from five to three dimensions: month, local time, and modip (modified dip latitude). We found that the standard deviation of the day-to-day variability varies according to (in percent of the monthly median value computed with IRI): (i) NmF2 at noontime: ±10% to ±30% with maxima over the northern and southern peaks of the Equatorial Anomaly; (ii) NmF2 at midnight: ±20% to ±45%, with the greatest values in the equatorial region during the months of May and September; (iii) hmF2 at noontime: ±2% to ±10% with minima over the modip equator; and (iv) hmF2 at midnight: ±3% to ±11% with the greatest values in the equatorial region from January to May and from September to January.
Fil: Brunini, Claudio Antonio. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Azpilicueta, Francisco Javier. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Janches, Diego. Nasa Goddard Space Flight Center; Estados Unidos
description In this work we explore the possibility of using COSMIC/FORMOSAT-3 radio occultation profiles (ROP) to establish a statistical model of the deviations that can be expected between the monthly median values of NmF2 and hmF2 computed with the International Reference Ionosphere (IRI) and the actual values of these parameters. The actual values are retrieved from the ROP after an interactively re-weighted Least Square fit that, complemented with a statistical test, allows filtering of unreliable data and estimating the errors of the retrieved values. The differences between the retrieved values and the monthly median values computed from IRI are interpreted as the superposition of a systematic bias (attributed to both, IRI and ROP), random errors in ROP, and the day-to-day variability, which is unaccounted for by IRI. This variability is described with a five-dimensional function that depends on: the month, the solar activity, the geomagnetic conditions, the modip latitude, and the local time. Empirical values of this function are estimated in the form of regular grids. Since this research is restricted to low solar activity and quiet geomagnetic conditions, the grid is reduced from five to three dimensions: month, local time, and modip (modified dip latitude). We found that the standard deviation of the day-to-day variability varies according to (in percent of the monthly median value computed with IRI): (i) NmF2 at noontime: ±10% to ±30% with maxima over the northern and southern peaks of the Equatorial Anomaly; (ii) NmF2 at midnight: ±20% to ±45%, with the greatest values in the equatorial region during the months of May and September; (iii) hmF2 at noontime: ±2% to ±10% with minima over the modip equator; and (iv) hmF2 at midnight: ±3% to ±11% with the greatest values in the equatorial region from January to May and from September to January.
publishDate 2015
dc.date.none.fl_str_mv 2015-04
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/11336/17968
Brunini, Claudio Antonio; Azpilicueta, Francisco Javier; Janches, Diego; An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI; Elsevier; Advances In Space Research; 55; 8; 4-2015; 2033-2040
0273-1177
url http://hdl.handle.net/11336/17968
identifier_str_mv Brunini, Claudio Antonio; Azpilicueta, Francisco Javier; Janches, Diego; An attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI; Elsevier; Advances In Space Research; 55; 8; 4-2015; 2033-2040
0273-1177
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0273117714004797
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.asr.2014.07.023
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 Elsevier
publisher.none.fl_str_mv Elsevier
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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