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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/17968
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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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1844613555391823872 |
score |
13.070432 |