Measuring the magnetic field of a trans-equatorial loop system using coronal seismology

Autores
Long, David M.; Valori, G.; Pérez-Suárez, D.; Morton, R. J.; Vasquez, Alberto Marcos
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. EIT waves are freely-propagating global pulses in the low corona which are strongly associated with the initial evolution of coronal mass ejections (CMEs). They are thought to be large-Amplitude, fast-mode magnetohydrodynamic waves initially driven by the rapid expansion of a CME in the low corona. Aims. An EIT wave was observed on 6 July 2012 to impact an adjacent trans-equatorial loop system which then exhibited a decaying oscillation as it returned to rest. Observations of the loop oscillations were used to estimate the magnetic field strength of the loop system by studying the decaying oscillation of the loop, measuring the propagation of ubiquitous transverse waves in the loop and extrapolating the magnetic field from observed magnetograms. Methods. Observations from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory (SDO/AIA) and the Coronal Multi-channel Polarimeter (CoMP) were used to study the event. An Empirical Mode Decomposition analysis was used to characterise the oscillation of the loop system in CoMP Doppler velocity and line width and in AIA intensity. Results. The loop system was shown to oscillate in the 2nd harmonic mode rather than at the fundamental frequency, with the seismological analysis returning an estimated magnetic field strength of 5.5 ± 1.5 G. This compares to the magnetic field strength estimates of 1-9 G and 3-9 G found using the measurements of transverse wave propagation and magnetic field extrapolation respectively.
Fil: Long, David M.. Colegio Universitario de Londres; Reino Unido
Fil: Valori, G.. Colegio Universitario de Londres; Reino Unido
Fil: Pérez-Suárez, D.. Colegio Universitario de Londres; Reino Unido
Fil: Morton, R. J.. University Of Northumbria; Reino Unido
Fil: Vasquez, Alberto Marcos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
SUN: CORONA
SUN: MAGNETIC FIELDS
SUN: OSCILLATIONS
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:11336/92531
Acceder
id CONICETDig_9f21e519e2e1ea3fa2bc77edd86c2317
oai_identifier_str oai:ri.conicet.gov.ar:11336/92531
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Measuring the magnetic field of a trans-equatorial loop system using coronal seismologyLong, David M.Valori, G.Pérez-Suárez, D.Morton, R. J.Vasquez, Alberto MarcosSUN: CORONASUN: MAGNETIC FIELDSSUN: OSCILLATIONShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. EIT waves are freely-propagating global pulses in the low corona which are strongly associated with the initial evolution of coronal mass ejections (CMEs). They are thought to be large-Amplitude, fast-mode magnetohydrodynamic waves initially driven by the rapid expansion of a CME in the low corona. Aims. An EIT wave was observed on 6 July 2012 to impact an adjacent trans-equatorial loop system which then exhibited a decaying oscillation as it returned to rest. Observations of the loop oscillations were used to estimate the magnetic field strength of the loop system by studying the decaying oscillation of the loop, measuring the propagation of ubiquitous transverse waves in the loop and extrapolating the magnetic field from observed magnetograms. Methods. Observations from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory (SDO/AIA) and the Coronal Multi-channel Polarimeter (CoMP) were used to study the event. An Empirical Mode Decomposition analysis was used to characterise the oscillation of the loop system in CoMP Doppler velocity and line width and in AIA intensity. Results. The loop system was shown to oscillate in the 2nd harmonic mode rather than at the fundamental frequency, with the seismological analysis returning an estimated magnetic field strength of 5.5 ± 1.5 G. This compares to the magnetic field strength estimates of 1-9 G and 3-9 G found using the measurements of transverse wave propagation and magnetic field extrapolation respectively.Fil: Long, David M.. Colegio Universitario de Londres; Reino UnidoFil: Valori, G.. Colegio Universitario de Londres; Reino UnidoFil: Pérez-Suárez, D.. Colegio Universitario de Londres; Reino UnidoFil: Morton, R. J.. University Of Northumbria; Reino UnidoFil: Vasquez, Alberto Marcos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaEDP Sciences2017-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/92531Long, David M.; Valori, G.; Pérez-Suárez, D.; Morton, R. J.; Vasquez, Alberto Marcos; Measuring the magnetic field of a trans-equatorial loop system using coronal seismology; EDP Sciences; Astronomy and Astrophysics; 603; A101; 7-2017; 1-120004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201730413info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:49:19Zoai:ri.conicet.gov.ar:11336/92531instacron: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:34982025-09-03 09:49:19.918CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
title Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
spellingShingle Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
Long, David M.
SUN: CORONA
SUN: MAGNETIC FIELDS
SUN: OSCILLATIONS
title_short Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
title_full Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
title_fullStr Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
title_full_unstemmed Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
title_sort Measuring the magnetic field of a trans-equatorial loop system using coronal seismology
dc.creator.none.fl_str_mv Long, David M.
Valori, G.
Pérez-Suárez, D.
Morton, R. J.
Vasquez, Alberto Marcos
author Long, David M.
author_facet Long, David M.
Valori, G.
Pérez-Suárez, D.
Morton, R. J.
Vasquez, Alberto Marcos
author_role author
author2 Valori, G.
Pérez-Suárez, D.
Morton, R. J.
Vasquez, Alberto Marcos
author2_role author
author
author
author
dc.subject.none.fl_str_mv SUN: CORONA
SUN: MAGNETIC FIELDS
SUN: OSCILLATIONS
topic SUN: CORONA
SUN: MAGNETIC FIELDS
SUN: OSCILLATIONS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. EIT waves are freely-propagating global pulses in the low corona which are strongly associated with the initial evolution of coronal mass ejections (CMEs). They are thought to be large-Amplitude, fast-mode magnetohydrodynamic waves initially driven by the rapid expansion of a CME in the low corona. Aims. An EIT wave was observed on 6 July 2012 to impact an adjacent trans-equatorial loop system which then exhibited a decaying oscillation as it returned to rest. Observations of the loop oscillations were used to estimate the magnetic field strength of the loop system by studying the decaying oscillation of the loop, measuring the propagation of ubiquitous transverse waves in the loop and extrapolating the magnetic field from observed magnetograms. Methods. Observations from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory (SDO/AIA) and the Coronal Multi-channel Polarimeter (CoMP) were used to study the event. An Empirical Mode Decomposition analysis was used to characterise the oscillation of the loop system in CoMP Doppler velocity and line width and in AIA intensity. Results. The loop system was shown to oscillate in the 2nd harmonic mode rather than at the fundamental frequency, with the seismological analysis returning an estimated magnetic field strength of 5.5 ± 1.5 G. This compares to the magnetic field strength estimates of 1-9 G and 3-9 G found using the measurements of transverse wave propagation and magnetic field extrapolation respectively.
Fil: Long, David M.. Colegio Universitario de Londres; Reino Unido
Fil: Valori, G.. Colegio Universitario de Londres; Reino Unido
Fil: Pérez-Suárez, D.. Colegio Universitario de Londres; Reino Unido
Fil: Morton, R. J.. University Of Northumbria; Reino Unido
Fil: Vasquez, Alberto Marcos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description Context. EIT waves are freely-propagating global pulses in the low corona which are strongly associated with the initial evolution of coronal mass ejections (CMEs). They are thought to be large-Amplitude, fast-mode magnetohydrodynamic waves initially driven by the rapid expansion of a CME in the low corona. Aims. An EIT wave was observed on 6 July 2012 to impact an adjacent trans-equatorial loop system which then exhibited a decaying oscillation as it returned to rest. Observations of the loop oscillations were used to estimate the magnetic field strength of the loop system by studying the decaying oscillation of the loop, measuring the propagation of ubiquitous transverse waves in the loop and extrapolating the magnetic field from observed magnetograms. Methods. Observations from the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory (SDO/AIA) and the Coronal Multi-channel Polarimeter (CoMP) were used to study the event. An Empirical Mode Decomposition analysis was used to characterise the oscillation of the loop system in CoMP Doppler velocity and line width and in AIA intensity. Results. The loop system was shown to oscillate in the 2nd harmonic mode rather than at the fundamental frequency, with the seismological analysis returning an estimated magnetic field strength of 5.5 ± 1.5 G. This compares to the magnetic field strength estimates of 1-9 G and 3-9 G found using the measurements of transverse wave propagation and magnetic field extrapolation respectively.
publishDate 2017
dc.date.none.fl_str_mv 2017-07
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/11336/92531
Long, David M.; Valori, G.; Pérez-Suárez, D.; Morton, R. J.; Vasquez, Alberto Marcos; Measuring the magnetic field of a trans-equatorial loop system using coronal seismology; EDP Sciences; Astronomy and Astrophysics; 603; A101; 7-2017; 1-12
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/92531
identifier_str_mv Long, David M.; Valori, G.; Pérez-Suárez, D.; Morton, R. J.; Vasquez, Alberto Marcos; Measuring the magnetic field of a trans-equatorial loop system using coronal seismology; EDP Sciences; Astronomy and Astrophysics; 603; A101; 7-2017; 1-12
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201730413
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 EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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_ 1842268967115161600
score 13.13397

Publicaciones similares