A technique for routinely updating the ITU-R database using radio occultation electron density profiles
- Autores
- Brunini, Claudio Antonio; Azpilicueta, Francisco Javier; Nava, Bruno
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Well credited and widely used ionospheric models, such as the International Reference Ionosphere or NeQuick, describe the variation of the electron density with height by means of a piecewise profile tied to the F2-peak parameters: the electron density, NₘF2, and the height, hₘF2. Accurate values of these parameters are crucial for retrieving reliable electron density estimations from those models. When direct measurements of these parameters are not available, the models compute the parameters using the so-called ITU-R database, which was established in the early 1960s. This paper presents a technique aimed at routinely updating the ITU-R database using radio occultation electron density profiles derived from GPS measurements gathered from low Earth orbit satellites. Before being used, these radio occultation profiles are validated by fitting to them an electron density model. A re-weighted Least Squares algorithm is used for down-weighting unreliable measurements (occasionally, entire profiles) and to retrieve NₘF2 and hₘF2 values—together with their error estimates—from the profiles. These values are used to monthly update the database, which consists of two sets of ITU-R-like coefficients that could easily be implemented in the IRI or NeQuick models. The technique was tested with radio occultation electron density profiles that are delivered to the community by the COSMIC/FORMOSAT-3 mission team. Tests were performed for solstices and equinoxes seasons in high and low-solar activity conditions. The global mean error of the resulting maps—estimated by the Least Squares technique—is between 0.5 × 10¹⁰ and 3.6 × 10¹⁰ elec/m⁻³ for the F2-peak electron density (which is equivalent to 7 % of the value of the estimated parameter) and from 2.0 to 5.6 km for the height (∼2 %).
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Astronomía
Ionosphere
F2-peak parameters
ITU-R maps updating
International Reference Ionosphere (IRI)
NeQuick
Radio-occultation - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/146348
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A technique for routinely updating the ITU-R database using radio occultation electron density profilesBrunini, Claudio AntonioAzpilicueta, Francisco JavierNava, BrunoAstronomíaIonosphereF2-peak parametersITU-R maps updatingInternational Reference Ionosphere (IRI)NeQuickRadio-occultationWell credited and widely used ionospheric models, such as the International Reference Ionosphere or NeQuick, describe the variation of the electron density with height by means of a piecewise profile tied to the F2-peak parameters: the electron density, NₘF2, and the height, hₘF2. Accurate values of these parameters are crucial for retrieving reliable electron density estimations from those models. When direct measurements of these parameters are not available, the models compute the parameters using the so-called ITU-R database, which was established in the early 1960s. This paper presents a technique aimed at routinely updating the ITU-R database using radio occultation electron density profiles derived from GPS measurements gathered from low Earth orbit satellites. Before being used, these radio occultation profiles are validated by fitting to them an electron density model. A re-weighted Least Squares algorithm is used for down-weighting unreliable measurements (occasionally, entire profiles) and to retrieve NₘF2 and hₘF2 values—together with their error estimates—from the profiles. These values are used to monthly update the database, which consists of two sets of ITU-R-like coefficients that could easily be implemented in the IRI or NeQuick models. The technique was tested with radio occultation electron density profiles that are delivered to the community by the COSMIC/FORMOSAT-3 mission team. Tests were performed for solstices and equinoxes seasons in high and low-solar activity conditions. The global mean error of the resulting maps—estimated by the Least Squares technique—is between 0.5 × 10¹⁰ and 3.6 × 10¹⁰ elec/m⁻³ for the F2-peak electron density (which is equivalent to 7 % of the value of the estimated parameter) and from 2.0 to 5.6 km for the height (∼2 %).Facultad de Ciencias Astronómicas y Geofísicas2013-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf813-823http://sedici.unlp.edu.ar/handle/10915/146348enginfo:eu-repo/semantics/altIdentifier/issn/0949-7714info:eu-repo/semantics/altIdentifier/issn/1432-1394info:eu-repo/semantics/altIdentifier/doi/10.1007/s00190-013-0648-xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:32:12Zoai:sedici.unlp.edu.ar:10915/146348Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:32:13.129SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
title |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
spellingShingle |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles Brunini, Claudio Antonio Astronomía Ionosphere F2-peak parameters ITU-R maps updating International Reference Ionosphere (IRI) NeQuick Radio-occultation |
title_short |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
title_full |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
title_fullStr |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
title_full_unstemmed |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
title_sort |
A technique for routinely updating the ITU-R database using radio occultation electron density profiles |
dc.creator.none.fl_str_mv |
Brunini, Claudio Antonio Azpilicueta, Francisco Javier Nava, Bruno |
author |
Brunini, Claudio Antonio |
author_facet |
Brunini, Claudio Antonio Azpilicueta, Francisco Javier Nava, Bruno |
author_role |
author |
author2 |
Azpilicueta, Francisco Javier Nava, Bruno |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Astronomía Ionosphere F2-peak parameters ITU-R maps updating International Reference Ionosphere (IRI) NeQuick Radio-occultation |
topic |
Astronomía Ionosphere F2-peak parameters ITU-R maps updating International Reference Ionosphere (IRI) NeQuick Radio-occultation |
dc.description.none.fl_txt_mv |
Well credited and widely used ionospheric models, such as the International Reference Ionosphere or NeQuick, describe the variation of the electron density with height by means of a piecewise profile tied to the F2-peak parameters: the electron density, NₘF2, and the height, hₘF2. Accurate values of these parameters are crucial for retrieving reliable electron density estimations from those models. When direct measurements of these parameters are not available, the models compute the parameters using the so-called ITU-R database, which was established in the early 1960s. This paper presents a technique aimed at routinely updating the ITU-R database using radio occultation electron density profiles derived from GPS measurements gathered from low Earth orbit satellites. Before being used, these radio occultation profiles are validated by fitting to them an electron density model. A re-weighted Least Squares algorithm is used for down-weighting unreliable measurements (occasionally, entire profiles) and to retrieve NₘF2 and hₘF2 values—together with their error estimates—from the profiles. These values are used to monthly update the database, which consists of two sets of ITU-R-like coefficients that could easily be implemented in the IRI or NeQuick models. The technique was tested with radio occultation electron density profiles that are delivered to the community by the COSMIC/FORMOSAT-3 mission team. Tests were performed for solstices and equinoxes seasons in high and low-solar activity conditions. The global mean error of the resulting maps—estimated by the Least Squares technique—is between 0.5 × 10¹⁰ and 3.6 × 10¹⁰ elec/m⁻³ for the F2-peak electron density (which is equivalent to 7 % of the value of the estimated parameter) and from 2.0 to 5.6 km for the height (∼2 %). Facultad de Ciencias Astronómicas y Geofísicas |
description |
Well credited and widely used ionospheric models, such as the International Reference Ionosphere or NeQuick, describe the variation of the electron density with height by means of a piecewise profile tied to the F2-peak parameters: the electron density, NₘF2, and the height, hₘF2. Accurate values of these parameters are crucial for retrieving reliable electron density estimations from those models. When direct measurements of these parameters are not available, the models compute the parameters using the so-called ITU-R database, which was established in the early 1960s. This paper presents a technique aimed at routinely updating the ITU-R database using radio occultation electron density profiles derived from GPS measurements gathered from low Earth orbit satellites. Before being used, these radio occultation profiles are validated by fitting to them an electron density model. A re-weighted Least Squares algorithm is used for down-weighting unreliable measurements (occasionally, entire profiles) and to retrieve NₘF2 and hₘF2 values—together with their error estimates—from the profiles. These values are used to monthly update the database, which consists of two sets of ITU-R-like coefficients that could easily be implemented in the IRI or NeQuick models. The technique was tested with radio occultation electron density profiles that are delivered to the community by the COSMIC/FORMOSAT-3 mission team. Tests were performed for solstices and equinoxes seasons in high and low-solar activity conditions. The global mean error of the resulting maps—estimated by the Least Squares technique—is between 0.5 × 10¹⁰ and 3.6 × 10¹⁰ elec/m⁻³ for the F2-peak electron density (which is equivalent to 7 % of the value of the estimated parameter) and from 2.0 to 5.6 km for the height (∼2 %). |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-09 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/146348 |
url |
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dc.language.none.fl_str_mv |
eng |
language |
eng |
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