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Gibson, S.E.; Fletcher, L.; Del Zanna, G.; Pike, C.D.; Mason, H.E.; Mandrini, C.H.; Démoulin, P.; Gilbert, H.; Burkepile, J.; Holzer, T.; Alexander, D.; Liu, Y.; Nitta, N.; Qiu, J.; Schmieder, B.; Thompson, B.J. "The structure and evolution of a sigmoidal active region" (2002) Astrophysical Journal. 574(2 I):1021-1038
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Abstract:

Solar coronal sigmoidal active regions have been shown to be precursors to some coronal mass ejections. Sigmoids, or S-shaped structures, may be indicators of twisted or helical magnetic structures, having an increased likelihood of eruption. We present here an analysis of a sigmoidal region's three-dimensional structure and how it evolves in relation to its eruptive dynamics. We use data taken during a recent study of a sigmoidal active region passing across the solar disk (an element of the third Whole Sun Month campaign). While S-shaped structures are generally observed in soft X-ray (SXR) emission, the observations that we present demonstrate their visibility at a range of wavelengths including those showing an associated sigmoidal filament. We examine the relationship between the S-shaped structures seen in SXR and those seen in cooler lines in order to probe the sigmoidal region's three-dimensional density and temperature structure. We also consider magnetic field observations and extrapolations in relation to these coronal structures. We present an interpretation of the disk passage of the sigmoidal region, in terms of a twisted magnetic flux rope that emerges into and equilibrates with overlying coronal magnetic field structures, which explains many of the key observed aspects of the region's structure and evolution. In particular, the evolving flux rope interpretation provides insight into why and how the region moves between active and quiescent phases, how the region's sigmoidicity is maintained during its evolution, and under what circumstances sigmoidal structures are apparent at a range of wavelengths.

Registro:

Documento: Artículo
Título:The structure and evolution of a sigmoidal active region
Autor:Gibson, S.E.; Fletcher, L.; Del Zanna, G.; Pike, C.D.; Mason, H.E.; Mandrini, C.H.; Démoulin, P.; Gilbert, H.; Burkepile, J.; Holzer, T.; Alexander, D.; Liu, Y.; Nitta, N.; Qiu, J.; Schmieder, B.; Thompson, B.J.
Filiación:HAO, NCAR, P.O. Box 3000, Boulder, CO 80307, United States
Department of Physics, University of Glasgow, Glasgow G12 8QQ, United Kingdom
DAMTP, University of Cambridge, Silver Street, Cambridge CB3 9EW, United Kingdom
Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom
Inst. de Astron./Fis. del Espacio, Casilla de Correo 67, Sucursal 28, Buenos Aires 1428, Argentina
Observatoire de Paris, Section Meudon, URA 2080 (CNRS), F-92195 Meudon Principal Cedex, France
Lockheed-Martin Solar/Astrophys. L., Org L9-41/B252, 3251 Hanover Street, Palo Alto, CA 94304, United States
HEPL, CSSA, Stanford University, Stanford, CA 944305-4085, United States
Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, CA 92314-9672, United States
NASA Goddard Space Flight Center, Code 682, Greenbelt, MD 20771, United States
Palabras clave:MHD; Sun: activity; Sun: magnetic fields
Año:2002
Volumen:574
Número:2 I
Página de inicio:1021
Página de fin:1038
DOI: http://dx.doi.org/10.1086/341090
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v574_n2I_p1021_Gibson

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Citas:

---------- APA ----------
Gibson, S.E., Fletcher, L., Del Zanna, G., Pike, C.D., Mason, H.E., Mandrini, C.H., Démoulin, P.,..., Thompson, B.J. (2002) . The structure and evolution of a sigmoidal active region. Astrophysical Journal, 574(2 I), 1021-1038.
http://dx.doi.org/10.1086/341090
---------- CHICAGO ----------
Gibson, S.E., Fletcher, L., Del Zanna, G., Pike, C.D., Mason, H.E., Mandrini, C.H., et al. "The structure and evolution of a sigmoidal active region" . Astrophysical Journal 574, no. 2 I (2002) : 1021-1038.
http://dx.doi.org/10.1086/341090
---------- MLA ----------
Gibson, S.E., Fletcher, L., Del Zanna, G., Pike, C.D., Mason, H.E., Mandrini, C.H., et al. "The structure and evolution of a sigmoidal active region" . Astrophysical Journal, vol. 574, no. 2 I, 2002, pp. 1021-1038.
http://dx.doi.org/10.1086/341090
---------- VANCOUVER ----------
Gibson, S.E., Fletcher, L., Del Zanna, G., Pike, C.D., Mason, H.E., Mandrini, C.H., et al. The structure and evolution of a sigmoidal active region. Astrophys. J. 2002;574(2 I):1021-1038.
http://dx.doi.org/10.1086/341090