Artículo
Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
van Driel Gesztelyi, Lidia; Culhane, J. L.; Baker, D.; Démoulin, Pascal; Mandrini, Cristina Hemilse
; DeRosa, M.L.; Rouillard, A.P.; Opitz, A.; Stenborg, G.; Vourlidas, A.; Brooks, D.H.
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Fecha de publicación:
11/2012
Editorial:
Springer
Revista:
Solar Physics
ISSN:
0038-0938
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Active Regions
,
Magnetic Extrapolations
,
Magnetic Field
,
Solar Wind
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
van Driel Gesztelyi, Lidia; Culhane, J. L.; Baker, D.; Démoulin, Pascal; Mandrini, Cristina Hemilse; et al.; Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind; Springer; Solar Physics; 281; 1; 11-2012; 237-262
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