Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment

Seeking to establish whether active-region upflow material contributes to the slow solar wind, we examine in detail the plasma upflows from Active Region (AR) 10978, which crossed the Sun's disc in the interval 8 to 16 December 2007 during Carrington rotation (CR) 2064. In previous work, using...

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Autores principales: Culhane, J.L., Brooks, D.H., van Driel-Gesztelyi, L., Démoulin, P., Baker, D., DeRosa, M.L., Mandrini, C.H., Zhao, L., Zurbuchen, T.H.
Formato: JOUR
Materias:
Active region upflow
Magnetic topology
Slow solar wind contribution
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00380938_v289_n10_p3799_Culhane
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00380938_v289_n10_p3799_Culhane
record_format dspace
spelling todo:paper_00380938_v289_n10_p3799_Culhane2023-10-03T14:48:49Z Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment Culhane, J.L. Brooks, D.H. van Driel-Gesztelyi, L. Démoulin, P. Baker, D. DeRosa, M.L. Mandrini, C.H. Zhao, L. Zurbuchen, T.H. Active region upflow Magnetic topology Slow solar wind contribution Seeking to establish whether active-region upflow material contributes to the slow solar wind, we examine in detail the plasma upflows from Active Region (AR) 10978, which crossed the Sun's disc in the interval 8 to 16 December 2007 during Carrington rotation (CR) 2064. In previous work, using data from the Hinode/EUV Imaging Spectrometer, upflow velocity evolution was extensively studied as the region crossed the disc, while a linear force-free-field magnetic extrapolation was used to confirm aspects of the velocity evolution and to establish the presence of quasi-separatrix layers at the upflow source areas. The plasma properties, temperature, density, and first ionisation potential bias [FIP-bias] were measured with the spectrometer during the disc passage of the active region. Global potential-field source-surface (PFSS) models showed that AR 10978 was completely covered by the closed field of a helmet streamer that is part of the streamer belt. Therefore it is not clear how any of the upflowing AR-associated plasma could reach the source surface at 2.5 R⊙ and contribute to the slow solar wind. However, a detailed examination of solar-wind in-situ data obtained by the Advanced Composition Explorer (ACE) spacecraft at the L1 point shows that increases in O7+/O6+, C6+/C5+, and Fe/O - a FIP-bias proxy - are present before the heliospheric current-sheet crossing. These increases, along with an accompanying reduction in proton velocity and an increase in density are characteristic of both AR and slow-solar-wind plasma. Finally, we describe a two-step reconnection process by which some of the upflowing plasma from the AR might reach the heliosphere. © 2014 The Author(s). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00380938_v289_n10_p3799_Culhane
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Active region upflow
Magnetic topology
Slow solar wind contribution
spellingShingle Active region upflow
Magnetic topology
Slow solar wind contribution
Culhane, J.L.
Brooks, D.H.
van Driel-Gesztelyi, L.
Démoulin, P.
Baker, D.
DeRosa, M.L.
Mandrini, C.H.
Zhao, L.
Zurbuchen, T.H.
Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
topic_facet Active region upflow
Magnetic topology
Slow solar wind contribution
description Seeking to establish whether active-region upflow material contributes to the slow solar wind, we examine in detail the plasma upflows from Active Region (AR) 10978, which crossed the Sun's disc in the interval 8 to 16 December 2007 during Carrington rotation (CR) 2064. In previous work, using data from the Hinode/EUV Imaging Spectrometer, upflow velocity evolution was extensively studied as the region crossed the disc, while a linear force-free-field magnetic extrapolation was used to confirm aspects of the velocity evolution and to establish the presence of quasi-separatrix layers at the upflow source areas. The plasma properties, temperature, density, and first ionisation potential bias [FIP-bias] were measured with the spectrometer during the disc passage of the active region. Global potential-field source-surface (PFSS) models showed that AR 10978 was completely covered by the closed field of a helmet streamer that is part of the streamer belt. Therefore it is not clear how any of the upflowing AR-associated plasma could reach the source surface at 2.5 R⊙ and contribute to the slow solar wind. However, a detailed examination of solar-wind in-situ data obtained by the Advanced Composition Explorer (ACE) spacecraft at the L1 point shows that increases in O7+/O6+, C6+/C5+, and Fe/O - a FIP-bias proxy - are present before the heliospheric current-sheet crossing. These increases, along with an accompanying reduction in proton velocity and an increase in density are characteristic of both AR and slow-solar-wind plasma. Finally, we describe a two-step reconnection process by which some of the upflowing plasma from the AR might reach the heliosphere. © 2014 The Author(s).
format JOUR
author Culhane, J.L.
Brooks, D.H.
van Driel-Gesztelyi, L.
Démoulin, P.
Baker, D.
DeRosa, M.L.
Mandrini, C.H.
Zhao, L.
Zurbuchen, T.H.
author_facet Culhane, J.L.
Brooks, D.H.
van Driel-Gesztelyi, L.
Démoulin, P.
Baker, D.
DeRosa, M.L.
Mandrini, C.H.
Zhao, L.
Zurbuchen, T.H.
author_sort Culhane, J.L.
title Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
title_short Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
title_full Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
title_fullStr Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
title_full_unstemmed Tracking Solar Active Region Outflow Plasma from Its Source to the Near-Earth Environment
title_sort tracking solar active region outflow plasma from its source to the near-earth environment
url http://hdl.handle.net/20.500.12110/paper_00380938_v289_n10_p3799_Culhane
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