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: Mandrini, Cristina Hemilse, Stenborg, Guillermo Adrián
Publicado: 2012
Materias:
Active regions
Magnetic extrapolations
Magnetic field
Solar wind
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v281_n1_p237_vanDrielGesztelyi
http://hdl.handle.net/20.500.12110/paper_00380938_v281_n1_p237_vanDrielGesztelyi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00380938_v281_n1_p237_vanDrielGesztelyi
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spelling paper:paper_00380938_v281_n1_p237_vanDrielGesztelyi2023-06-08T15:02:48Z Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind Mandrini, Cristina Hemilse Stenborg, Guillermo Adrián 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v281_n1_p237_vanDrielGesztelyi 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
Mandrini, Cristina Hemilse
Stenborg, Guillermo Adrián
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.
author Mandrini, Cristina Hemilse
Stenborg, Guillermo Adrián
author_facet Mandrini, Cristina Hemilse
Stenborg, Guillermo Adrián
author_sort Mandrini, Cristina Hemilse
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
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v281_n1_p237_vanDrielGesztelyi
http://hdl.handle.net/20.500.12110/paper_00380938_v281_n1_p237_vanDrielGesztelyi
work_keys_str_mv AT mandrinicristinahemilse magnetictopologyofactiveregionsandcoronalholesimplicationsforcoronaloutflowsandthesolarwind
AT stenborgguillermoadrian magnetictopologyofactiveregionsandcoronalholesimplicationsforcoronaloutflowsandthesolarwind
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