Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories

We present a sample of three large near-relativistic (>50 keV) electron events observed in 2001 by both the ACE and the Ulysses spacecraft, when Ulysses was at high-northern latitudes (>60°) and close to 2 AU. Despite the large latitudinal distance between the two spacecraft, electrons injecte...

ver descrição completa

Detalhes bibliográficos
Autores: Àgueda Costafreda, Neus, Vainio, Rami, Dalla, S., Lario i Loyo, David, Sanahuja i Parera, Blai
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/44049
Acesso em linha:https://hdl.handle.net/2445/44049
Access Level:acceso abierto
Palavra-chave:Astrofísica
Emissió electrònica
Activitat solar
Raigs còsmics
Electromagnetisme
Sol
Astrophysics
Electron emission
Solar activity
Cosmic rays
Electromagnetism
Sun
id ES_0cfcb0621ed055020bda7bb6485a09e2
oai_identifier_str oai:diposit.ub.edu:2445/44049
network_acronym_str ES
network_name_str España
repository_id_str
spelling Current Sheet Regulation of Solar Near-Relativistic Electron Injection HistoriesÀgueda Costafreda, NeusVainio, RamiDalla, S.Lario i Loyo, DavidSanahuja i Parera, BlaiAstrofísicaEmissió electrònicaActivitat solarRaigs còsmicsElectromagnetismeSolAstrophysicsElectron emissionSolar activityCosmic raysElectromagnetismSunWe present a sample of three large near-relativistic (>50 keV) electron events observed in 2001 by both the ACE and the Ulysses spacecraft, when Ulysses was at high-northern latitudes (>60°) and close to 2 AU. Despite the large latitudinal distance between the two spacecraft, electrons injected near the Sun reached both heliospheric locations. All three events were associated with large solar flares, strong decametric type II radio bursts and accompanied by wide (>212°) and fast (>1400 km s-1) coronal mass ejections (CMEs). We use advanced interplanetary transport simulations and make use of the directional intensities observed in situ by the spacecraft to infer the electron injection profile close to the Sun and the interplanetary transport conditions at both low and high latitudes. For the three selected events, we find similar interplanetary transport conditions at different heliolatitudes for a given event, with values of the mean free path ranging from 0.04 AU to 0.27 AU. We find differences in the injection profiles inferred for each spacecraft. We investigate the role that sector boundaries of the heliospheric current sheet (HCS) have on determining the characteristics of the electron injection profiles. Extended injection profiles, associated with coronal shocks, are found if the magnetic footpoints of the spacecraft lay in the same magnetic sector as the associated flare, while intermittent sparse injection episodes appear when the spacecraft footpoints are in the opposite sector or a wrap in the HCS bounded the CME structure.Institute of Physics2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/44049Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: http://dx.doi.org/10.1088/0004-637X/765/2/83Astrophysical Journal, 2013, vol. 765, num. 2, p. 1-9http://dx.doi.org/10.1088/0004-637X/765/2/83info:eu-repo/grantAgreement/EC/FP7/262773(c) American Astronomical Society, 2013info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/440492026-05-27T06:46:51Z
dc.title.none.fl_str_mv Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
title Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
spellingShingle Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
Àgueda Costafreda, Neus
Astrofísica
Emissió electrònica
Activitat solar
Raigs còsmics
Electromagnetisme
Sol
Astrophysics
Electron emission
Solar activity
Cosmic rays
Electromagnetism
Sun
title_short Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
title_full Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
title_fullStr Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
title_full_unstemmed Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
title_sort Current Sheet Regulation of Solar Near-Relativistic Electron Injection Histories
dc.creator.none.fl_str_mv Àgueda Costafreda, Neus
Vainio, Rami
Dalla, S.
Lario i Loyo, David
Sanahuja i Parera, Blai
author Àgueda Costafreda, Neus
author_facet Àgueda Costafreda, Neus
Vainio, Rami
Dalla, S.
Lario i Loyo, David
Sanahuja i Parera, Blai
author_role author
author2 Vainio, Rami
Dalla, S.
Lario i Loyo, David
Sanahuja i Parera, Blai
author2_role author
author
author
author
dc.subject.none.fl_str_mv Astrofísica
Emissió electrònica
Activitat solar
Raigs còsmics
Electromagnetisme
Sol
Astrophysics
Electron emission
Solar activity
Cosmic rays
Electromagnetism
Sun
topic Astrofísica
Emissió electrònica
Activitat solar
Raigs còsmics
Electromagnetisme
Sol
Astrophysics
Electron emission
Solar activity
Cosmic rays
Electromagnetism
Sun
description We present a sample of three large near-relativistic (>50 keV) electron events observed in 2001 by both the ACE and the Ulysses spacecraft, when Ulysses was at high-northern latitudes (>60°) and close to 2 AU. Despite the large latitudinal distance between the two spacecraft, electrons injected near the Sun reached both heliospheric locations. All three events were associated with large solar flares, strong decametric type II radio bursts and accompanied by wide (>212°) and fast (>1400 km s-1) coronal mass ejections (CMEs). We use advanced interplanetary transport simulations and make use of the directional intensities observed in situ by the spacecraft to infer the electron injection profile close to the Sun and the interplanetary transport conditions at both low and high latitudes. For the three selected events, we find similar interplanetary transport conditions at different heliolatitudes for a given event, with values of the mean free path ranging from 0.04 AU to 0.27 AU. We find differences in the injection profiles inferred for each spacecraft. We investigate the role that sector boundaries of the heliospheric current sheet (HCS) have on determining the characteristics of the electron injection profiles. Extended injection profiles, associated with coronal shocks, are found if the magnetic footpoints of the spacecraft lay in the same magnetic sector as the associated flare, while intermittent sparse injection episodes appear when the spacecraft footpoints are in the opposite sector or a wrap in the HCS bounded the CME structure.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/44049
url https://hdl.handle.net/2445/44049
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://dx.doi.org/10.1088/0004-637X/765/2/83
Astrophysical Journal, 2013, vol. 765, num. 2, p. 1-9
http://dx.doi.org/10.1088/0004-637X/765/2/83
info:eu-repo/grantAgreement/EC/FP7/262773
dc.rights.none.fl_str_mv (c) American Astronomical Society, 2013
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Astronomical Society, 2013
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics
publisher.none.fl_str_mv Institute of Physics
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869403314725060608
score 15,301603

Registos relacionados