Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind

During 2-18 January 2008 a pair of low-latitude opposite-polarity coronal holes (CHs) were observed on the Sun with two active regions (ARs) and the heliospheric plasma sheet located between them. We use the Hinode/EUV Imaging Spectrometer (EIS) to locate AR-related outflows and measure their veloci...

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Autores principales: van Driel-Gesztelyi, L., Culhane, J.L., Baker, D., Démoulin, P., Mandrini, C.H., DeRosa, M.L., Rouillard, A.P., Opitz, A., Stenborg, G., Vourlidas, A., Brooks, D.H.
Formato: JOUR
Materias:
Active regions
Magnetic extrapolations
Magnetic field
Solar wind
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00380938_v281_n1_p237_vanDrielGesztelyi
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00380938_v281_n1_p237_vanDrielGesztelyi2023-10-03T14:48:47Z Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind van Driel-Gesztelyi, L. Culhane, J.L. Baker, D. Démoulin, P. Mandrini, C.H. DeRosa, M.L. Rouillard, A.P. Opitz, A. Stenborg, G. Vourlidas, A. Brooks, D.H. Active regions Magnetic extrapolations Magnetic field Solar wind During 2-18 January 2008 a pair of low-latitude opposite-polarity coronal holes (CHs) were observed on the Sun with two active regions (ARs) and the heliospheric plasma sheet located between them. We use the Hinode/EUV Imaging Spectrometer (EIS) to locate AR-related outflows and measure their velocities. Solar-Terrestrial Relations Observatory (STEREO) imaging is also employed, as are the Advanced Composition Explorer (ACE) in-situ observations, to assess the resulting impacts on the solar wind (SW) properties. Magnetic-field extrapolations of the two ARs confirm that AR plasma outflows observed with EIS are co-spatial with quasi-separatrix layer locations, including the separatrix of a null point. Global potential-field source-surface modeling indicates that field lines in the vicinity of the null point extend up to the source surface, enabling a part of the EIS plasma upflows access to the SW. We find that similar upflow properties are also observed within closed-field regions that do not reach the source surface. We conclude that some of plasma upflows observed with EIS remain confined along closed coronal loops, but that a fraction of the plasma may be released into the slow SW. This suggests that ARs bordering coronal holes can contribute to the slow SW. Analyzing the in-situ data, we propose that the type of slow SW present depends on whether the AR is fully or partially enclosed by an overlying streamer. © 2012 Springer Science+Business Media B.V. Fil:Mandrini, C.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Stenborg, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00380938_v281_n1_p237_vanDrielGesztelyi
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 regions
Magnetic extrapolations
Magnetic field
Solar wind
spellingShingle Active regions
Magnetic extrapolations
Magnetic field
Solar wind
van Driel-Gesztelyi, L.
Culhane, J.L.
Baker, D.
Démoulin, P.
Mandrini, C.H.
DeRosa, M.L.
Rouillard, A.P.
Opitz, A.
Stenborg, G.
Vourlidas, A.
Brooks, D.H.
Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
topic_facet Active regions
Magnetic extrapolations
Magnetic field
Solar wind
description During 2-18 January 2008 a pair of low-latitude opposite-polarity coronal holes (CHs) were observed on the Sun with two active regions (ARs) and the heliospheric plasma sheet located between them. We use the Hinode/EUV Imaging Spectrometer (EIS) to locate AR-related outflows and measure their velocities. Solar-Terrestrial Relations Observatory (STEREO) imaging is also employed, as are the Advanced Composition Explorer (ACE) in-situ observations, to assess the resulting impacts on the solar wind (SW) properties. Magnetic-field extrapolations of the two ARs confirm that AR plasma outflows observed with EIS are co-spatial with quasi-separatrix layer locations, including the separatrix of a null point. Global potential-field source-surface modeling indicates that field lines in the vicinity of the null point extend up to the source surface, enabling a part of the EIS plasma upflows access to the SW. We find that similar upflow properties are also observed within closed-field regions that do not reach the source surface. We conclude that some of plasma upflows observed with EIS remain confined along closed coronal loops, but that a fraction of the plasma may be released into the slow SW. This suggests that ARs bordering coronal holes can contribute to the slow SW. Analyzing the in-situ data, we propose that the type of slow SW present depends on whether the AR is fully or partially enclosed by an overlying streamer. © 2012 Springer Science+Business Media B.V.
format JOUR
author van Driel-Gesztelyi, L.
Culhane, J.L.
Baker, D.
Démoulin, P.
Mandrini, C.H.
DeRosa, M.L.
Rouillard, A.P.
Opitz, A.
Stenborg, G.
Vourlidas, A.
Brooks, D.H.
author_facet van Driel-Gesztelyi, L.
Culhane, J.L.
Baker, D.
Démoulin, P.
Mandrini, C.H.
DeRosa, M.L.
Rouillard, A.P.
Opitz, A.
Stenborg, G.
Vourlidas, A.
Brooks, D.H.
author_sort van Driel-Gesztelyi, L.
title Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
title_short Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
title_full Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
title_fullStr Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
title_full_unstemmed Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
title_sort magnetic topology of active regions and coronal holes: implications for coronal outflows and the solar wind
url http://hdl.handle.net/20.500.12110/paper_00380938_v281_n1_p237_vanDrielGesztelyi
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