Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT

This work presents a statistical analysis of near-relativistic solar energetic electron event spectra near 1 au. We use measurements of the Solar Electron and Proton Telescope (SEPT) on board STEREO in the energy range of 45–425 keV and utilize the SEPT electron event list containing all electron ev...

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Autores: Dresing, N., Effenberger, Frederic, Gómez Herrero, Raúl|||0000-0002-5705-9236, Heber, Bernd, Klassen, Andreas, Kollhoff, Alexander, Richardson, Ian, Theesen, Solveig
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Alcalá (UAH)
Repositorio:e_Buah Biblioteca Digital Universidad de Alcalá
Idioma:inglés
OAI Identifier:oai:ebuah.uah.es:10017/60569
Acceso en línea:http://hdl.handle.net/10017/60569
https://dx.doi.org/10.3847/1538-4357/ab64e5
Access Level:acceso abierto
Palabra clave:Solar energetic electrons
Electron spectra
Electron acceleration
Física
Astronomía
Physics
Astronomy
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spelling Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPTDresing, N.Effenberger, FredericGómez Herrero, Raúl|||0000-0002-5705-9236Heber, BerndKlassen, AndreasKollhoff, AlexanderRichardson, IanTheesen, SolveigSolar energetic electronsElectron spectraElectron accelerationFísicaAstronomíaPhysicsAstronomyThis work presents a statistical analysis of near-relativistic solar energetic electron event spectra near 1 au. We use measurements of the Solar Electron and Proton Telescope (SEPT) on board STEREO in the energy range of 45–425 keV and utilize the SEPT electron event list containing all electron events observed by STEREO A and STEREO B from 2007 through 2018. We select 781 events with significant signal-to-noise ratios for our analysis and fit the spectra with single or broken-power-law functions of energy. We find 437 events showing broken power laws and 344 events only showing a single power law in the energy range of SEPT. For those events with broken power laws, we find a mean break energy of about 120 keV. We analyze the dependence of the spectral index on the rise times and peak intensities of the events as well as on the presence of relativistic electrons. The results show a relation between the power law spectral index and the rise times of the events with softer spectra belonging to rather impulsive events. Long rise-time events are associated with hard spectra as well as with the presence of higher-energy (>0.7 MeV) electrons. This group of events cannot be explained by a pure flare scenario but suggests an additional acceleration mechanism, involving a prolonged acceleration and/or injection of the particles. A dependence of the spectral index on the longitudinal separation from the parent solar source region was not found. A statistical analysis of the spectral indices during impulsively rising events where the rise times are below 20 minutes is also shown.Agencia Estatal de InvestigaciónThe American Astronomical Society20202020-02-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10017/60569https://dx.doi.org/10.3847/1538-4357/ab64e5reponame:e_Buah Biblioteca Digital Universidad de Alcaláinstname:Universidad de Alcalá (UAH)InglésengAgencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016 ESP2017-88436-R ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASES D Y Eopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-ShareAlike 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:ebuah.uah.es:10017/605692026-06-18T11:13:07Z
dc.title.none.fl_str_mv Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
title Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
spellingShingle Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
Dresing, N.
Solar energetic electrons
Electron spectra
Electron acceleration
Física
Astronomía
Physics
Astronomy
title_short Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
title_full Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
title_fullStr Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
title_full_unstemmed Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
title_sort Statistical results for solar energetic electron spectra observed over 12 yr with STEREO/SEPT
dc.creator.none.fl_str_mv Dresing, N.
Effenberger, Frederic
Gómez Herrero, Raúl|||0000-0002-5705-9236
Heber, Bernd
Klassen, Andreas
Kollhoff, Alexander
Richardson, Ian
Theesen, Solveig
author Dresing, N.
author_facet Dresing, N.
Effenberger, Frederic
Gómez Herrero, Raúl|||0000-0002-5705-9236
Heber, Bernd
Klassen, Andreas
Kollhoff, Alexander
Richardson, Ian
Theesen, Solveig
author_role author
author2 Effenberger, Frederic
Gómez Herrero, Raúl|||0000-0002-5705-9236
Heber, Bernd
Klassen, Andreas
Kollhoff, Alexander
Richardson, Ian
Theesen, Solveig
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Solar energetic electrons
Electron spectra
Electron acceleration
Física
Astronomía
Physics
Astronomy
topic Solar energetic electrons
Electron spectra
Electron acceleration
Física
Astronomía
Physics
Astronomy
description This work presents a statistical analysis of near-relativistic solar energetic electron event spectra near 1 au. We use measurements of the Solar Electron and Proton Telescope (SEPT) on board STEREO in the energy range of 45–425 keV and utilize the SEPT electron event list containing all electron events observed by STEREO A and STEREO B from 2007 through 2018. We select 781 events with significant signal-to-noise ratios for our analysis and fit the spectra with single or broken-power-law functions of energy. We find 437 events showing broken power laws and 344 events only showing a single power law in the energy range of SEPT. For those events with broken power laws, we find a mean break energy of about 120 keV. We analyze the dependence of the spectral index on the rise times and peak intensities of the events as well as on the presence of relativistic electrons. The results show a relation between the power law spectral index and the rise times of the events with softer spectra belonging to rather impulsive events. Long rise-time events are associated with hard spectra as well as with the presence of higher-energy (>0.7 MeV) electrons. This group of events cannot be explained by a pure flare scenario but suggests an additional acceleration mechanism, involving a prolonged acceleration and/or injection of the particles. A dependence of the spectral index on the longitudinal separation from the parent solar source region was not found. A statistical analysis of the spectral indices during impulsively rising events where the rise times are below 20 minutes is also shown.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10017/60569
https://dx.doi.org/10.3847/1538-4357/ab64e5
url http://hdl.handle.net/10017/60569
https://dx.doi.org/10.3847/1538-4357/ab64e5
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://dx.doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016 ESP2017-88436-R ENERGETIC PARTICLE DETECTOR EN SOLAR ORBITER: FASES D Y E
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-ShareAlike 4.0 International
http://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-ShareAlike 4.0 International
http://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The American Astronomical Society
publisher.none.fl_str_mv The American Astronomical Society
dc.source.none.fl_str_mv reponame:e_Buah Biblioteca Digital Universidad de Alcalá
instname:Universidad de Alcalá (UAH)
instname_str Universidad de Alcalá (UAH)
reponame_str e_Buah Biblioteca Digital Universidad de Alcalá
collection e_Buah Biblioteca Digital Universidad de Alcalá
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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