Continuous Doppler sounding of the ionosphere during solar flares

Autores
Chum, Jaroslav; Urbár, Jaroslav; Lastovicka, Jan; Cabrera, Miguel Angel; Liu, Jann-Yenq; Miranda Bonomi, Fernando Alberto; Fagre, Mariano; Fiser, Jirí; Mosna, Zbysek
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the propagation of radio waves. The ionospheric response to solar flares is investigated for three selected examples recorded during the maximum and decreasing phase of the solar cycle 24 with time resolution of several seconds by continuous Doppler sounding systems installed in the Czech Republic (50N, 14E), Taiwan (24N, 121E) and Northern Argentina (27S, 65W). The reflection heights of sounding signals are derived from nearby ionospheric sounders. The measured Doppler shifts are compared with EUV and X-ray data from the GOES-15 satellite. It is shown that the largest Doppler shifts are observed at times when the time derivatives of EUV fluxes are maximal, while the Doppler shifts are around zero at times when the EUV fluxes reach maxima. This means that loss processes balance the ionization when the EUV fluxes maximize. The attenuation of Doppler signal caused by enhanced electron density in the D and E layer was well correlated with the cosmic noise absorption measured by riometer. For large ionizing fluxes, the attenuation leads to very low signal-to-noise ratio, loss of the received signal, and inability to process both Doppler shift spectrograms and ionograms.
Fil: Chum, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Urbár, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Lastovicka, Jan. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Cabrera, Miguel Angel. Universidad Nacional de Tucumán; Argentina
Fil: Liu, Jann-Yenq. National Central University Taiwan;
Fil: Miranda Bonomi, Fernando Alberto. Universidad Nacional de Tucumán; Argentina
Fil: Fagre, Mariano. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Electricidad, Electrónica y Computación. Laboratorio de Telecomunicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
Fil: Fiser, Jirí. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Mosna, Zbysek. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Materia
HF DOPPLER SOUNDING
IONOSPHERE
RADIO WAVES
SOLAR FLARES
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:11336/81067
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/81067
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Continuous Doppler sounding of the ionosphere during solar flaresChum, JaroslavUrbár, JaroslavLastovicka, JanCabrera, Miguel AngelLiu, Jann-YenqMiranda Bonomi, Fernando AlbertoFagre, MarianoFiser, JiríMosna, ZbysekHF DOPPLER SOUNDINGIONOSPHERERADIO WAVESSOLAR FLAREShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the propagation of radio waves. The ionospheric response to solar flares is investigated for three selected examples recorded during the maximum and decreasing phase of the solar cycle 24 with time resolution of several seconds by continuous Doppler sounding systems installed in the Czech Republic (50N, 14E), Taiwan (24N, 121E) and Northern Argentina (27S, 65W). The reflection heights of sounding signals are derived from nearby ionospheric sounders. The measured Doppler shifts are compared with EUV and X-ray data from the GOES-15 satellite. It is shown that the largest Doppler shifts are observed at times when the time derivatives of EUV fluxes are maximal, while the Doppler shifts are around zero at times when the EUV fluxes reach maxima. This means that loss processes balance the ionization when the EUV fluxes maximize. The attenuation of Doppler signal caused by enhanced electron density in the D and E layer was well correlated with the cosmic noise absorption measured by riometer. For large ionizing fluxes, the attenuation leads to very low signal-to-noise ratio, loss of the received signal, and inability to process both Doppler shift spectrograms and ionograms.Fil: Chum, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;Fil: Urbár, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;Fil: Lastovicka, Jan. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;Fil: Cabrera, Miguel Angel. Universidad Nacional de Tucumán; ArgentinaFil: Liu, Jann-Yenq. National Central University Taiwan;Fil: Miranda Bonomi, Fernando Alberto. Universidad Nacional de Tucumán; ArgentinaFil: Fagre, Mariano. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Electricidad, Electrónica y Computación. Laboratorio de Telecomunicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Fiser, Jirí. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;Fil: Mosna, Zbysek. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;Terra Scientific Publishing2018-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/81067Chum, Jaroslav; Urbár, Jaroslav; Lastovicka, Jan; Cabrera, Miguel Angel; Liu, Jann-Yenq; et al.; Continuous Doppler sounding of the ionosphere during solar flares; Terra Scientific Publishing; Earth Planets And Space; 70; 1; 12-20181343-8832CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1186/s40623-018-0976-4info:eu-repo/semantics/altIdentifier/url/https://earth-planets-space.springeropen.com/articles/10.1186/s40623-018-0976-4info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:42:51Zoai:ri.conicet.gov.ar:11336/81067instacron: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 09:42:51.651CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Continuous Doppler sounding of the ionosphere during solar flares
title Continuous Doppler sounding of the ionosphere during solar flares
spellingShingle Continuous Doppler sounding of the ionosphere during solar flares
Chum, Jaroslav
HF DOPPLER SOUNDING
IONOSPHERE
RADIO WAVES
SOLAR FLARES
title_short Continuous Doppler sounding of the ionosphere during solar flares
title_full Continuous Doppler sounding of the ionosphere during solar flares
title_fullStr Continuous Doppler sounding of the ionosphere during solar flares
title_full_unstemmed Continuous Doppler sounding of the ionosphere during solar flares
title_sort Continuous Doppler sounding of the ionosphere during solar flares
dc.creator.none.fl_str_mv Chum, Jaroslav
Urbár, Jaroslav
Lastovicka, Jan
Cabrera, Miguel Angel
Liu, Jann-Yenq
Miranda Bonomi, Fernando Alberto
Fagre, Mariano
Fiser, Jirí
Mosna, Zbysek
author Chum, Jaroslav
author_facet Chum, Jaroslav
Urbár, Jaroslav
Lastovicka, Jan
Cabrera, Miguel Angel
Liu, Jann-Yenq
Miranda Bonomi, Fernando Alberto
Fagre, Mariano
Fiser, Jirí
Mosna, Zbysek
author_role author
author2 Urbár, Jaroslav
Lastovicka, Jan
Cabrera, Miguel Angel
Liu, Jann-Yenq
Miranda Bonomi, Fernando Alberto
Fagre, Mariano
Fiser, Jirí
Mosna, Zbysek
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv HF DOPPLER SOUNDING
IONOSPHERE
RADIO WAVES
SOLAR FLARES
topic HF DOPPLER SOUNDING
IONOSPHERE
RADIO WAVES
SOLAR FLARES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the propagation of radio waves. The ionospheric response to solar flares is investigated for three selected examples recorded during the maximum and decreasing phase of the solar cycle 24 with time resolution of several seconds by continuous Doppler sounding systems installed in the Czech Republic (50N, 14E), Taiwan (24N, 121E) and Northern Argentina (27S, 65W). The reflection heights of sounding signals are derived from nearby ionospheric sounders. The measured Doppler shifts are compared with EUV and X-ray data from the GOES-15 satellite. It is shown that the largest Doppler shifts are observed at times when the time derivatives of EUV fluxes are maximal, while the Doppler shifts are around zero at times when the EUV fluxes reach maxima. This means that loss processes balance the ionization when the EUV fluxes maximize. The attenuation of Doppler signal caused by enhanced electron density in the D and E layer was well correlated with the cosmic noise absorption measured by riometer. For large ionizing fluxes, the attenuation leads to very low signal-to-noise ratio, loss of the received signal, and inability to process both Doppler shift spectrograms and ionograms.
Fil: Chum, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Urbár, Jaroslav. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Lastovicka, Jan. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Cabrera, Miguel Angel. Universidad Nacional de Tucumán; Argentina
Fil: Liu, Jann-Yenq. National Central University Taiwan;
Fil: Miranda Bonomi, Fernando Alberto. Universidad Nacional de Tucumán; Argentina
Fil: Fagre, Mariano. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Electricidad, Electrónica y Computación. Laboratorio de Telecomunicaciones; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
Fil: Fiser, Jirí. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
Fil: Mosna, Zbysek. Institute Of Atmospheric Physics Of The Academy Of Sciences Of The Czech Republic;
description Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the propagation of radio waves. The ionospheric response to solar flares is investigated for three selected examples recorded during the maximum and decreasing phase of the solar cycle 24 with time resolution of several seconds by continuous Doppler sounding systems installed in the Czech Republic (50N, 14E), Taiwan (24N, 121E) and Northern Argentina (27S, 65W). The reflection heights of sounding signals are derived from nearby ionospheric sounders. The measured Doppler shifts are compared with EUV and X-ray data from the GOES-15 satellite. It is shown that the largest Doppler shifts are observed at times when the time derivatives of EUV fluxes are maximal, while the Doppler shifts are around zero at times when the EUV fluxes reach maxima. This means that loss processes balance the ionization when the EUV fluxes maximize. The attenuation of Doppler signal caused by enhanced electron density in the D and E layer was well correlated with the cosmic noise absorption measured by riometer. For large ionizing fluxes, the attenuation leads to very low signal-to-noise ratio, loss of the received signal, and inability to process both Doppler shift spectrograms and ionograms.
publishDate 2018
dc.date.none.fl_str_mv 2018-12
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/11336/81067
Chum, Jaroslav; Urbár, Jaroslav; Lastovicka, Jan; Cabrera, Miguel Angel; Liu, Jann-Yenq; et al.; Continuous Doppler sounding of the ionosphere during solar flares; Terra Scientific Publishing; Earth Planets And Space; 70; 1; 12-2018
1343-8832
CONICET Digital
CONICET
url http://hdl.handle.net/11336/81067
identifier_str_mv Chum, Jaroslav; Urbár, Jaroslav; Lastovicka, Jan; Cabrera, Miguel Angel; Liu, Jann-Yenq; et al.; Continuous Doppler sounding of the ionosphere during solar flares; Terra Scientific Publishing; Earth Planets And Space; 70; 1; 12-2018
1343-8832
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1186/s40623-018-0976-4
info:eu-repo/semantics/altIdentifier/url/https://earth-planets-space.springeropen.com/articles/10.1186/s40623-018-0976-4
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 Terra Scientific Publishing
publisher.none.fl_str_mv Terra Scientific Publishing
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
_version_ 1844613349276385280
score 13.070432

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