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Abstract:

In order to understand various solar phenomena controlled by the magnetic field, such as X-ray bright points, flares and prominence eruptions, the structure of the coronal magnetic field must be known. This requires a precise extrapolation of the photospheric magnetic field. Presently, only potential or linear force-free field approximations can be used easily. A more realistic modelling of the field is still an active research area because of well-known difficulties related to the nonlinear mixed elliptic-hyperbolic nature of the equations. An additional difficulty arises due to the complexity of the magnetic field structure which is caused by a discrete partition of the photospheric magnetic field. This complexity is not limited to magnetic regions having magnetic nulls (and so separatrices) but also occurs in those containing thin elongated volumes (called Quasi-Separatrix Layers) where the photospheric field-line linkage changes rapidly. There is a wide range for the thickness of such layers, which is determined by the character (bipolar or quadrupolar) of the magnetic region, by the sizes of the photospheric field concentrations and by the intensity of the electric currents. The aim of this paper is to analyse the recent nonlinear force-free field extrapolation techniques for complex coronal magnetic fields.

Registro:

Documento: Artículo
Título:Can we extrapolate a magnetic field when its topology is complex?
Autor:Démoulin, P.; Hénoux, J.C.; Mandrini, C.H.; Priest, E.R.
Filiación:Observatoire de Paris, Section de Meudon, UMR 2080 (CNRS), F-92195 Meudon Cedex, France
Inst. Astronomia y Fis. del Espacio, IAFE, CC.67, Suc. 28, 1428 Buenos Aires, Argentina
Math. and Compl. Sciences Department, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom
Año:1997
Volumen:174
Número:1-2
Página de inicio:73
Página de fin:89
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v174_n1-2_p73_Demoulin

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Citas:

---------- APA ----------
Démoulin, P., Hénoux, J.C., Mandrini, C.H. & Priest, E.R. (1997) . Can we extrapolate a magnetic field when its topology is complex?. Solar Physics, 174(1-2), 73-89.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v174_n1-2_p73_Demoulin [ ]
---------- CHICAGO ----------
Démoulin, P., Hénoux, J.C., Mandrini, C.H., Priest, E.R. "Can we extrapolate a magnetic field when its topology is complex?" . Solar Physics 174, no. 1-2 (1997) : 73-89.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v174_n1-2_p73_Demoulin [ ]
---------- MLA ----------
Démoulin, P., Hénoux, J.C., Mandrini, C.H., Priest, E.R. "Can we extrapolate a magnetic field when its topology is complex?" . Solar Physics, vol. 174, no. 1-2, 1997, pp. 73-89.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v174_n1-2_p73_Demoulin [ ]
---------- VANCOUVER ----------
Démoulin, P., Hénoux, J.C., Mandrini, C.H., Priest, E.R. Can we extrapolate a magnetic field when its topology is complex?. Sol. Phys. 1997;174(1-2):73-89.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v174_n1-2_p73_Demoulin [ ]