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Abstract:

We present a study of active region (AR) 7031, where several flares occurred throughout the last week of January, 1992. We analyze in detail the three largest flares, both in Hα and soft X-rays. During its transit across the disk this region interacted with another one (AR 7038), as indicated by the recurrent brightening in soft X-rays of an interconnecting loop, accompanied by sympathetic flaring. Using a linear force free extrapolation of the photospheric magnetic field, we compute the locations of Quasi-Separatrix Layers (QSLs), which are the likely places where the magnetic field can reconnect. We find that flare brightenings can be linked by field lines having footpoints at the QSLs. Furthermore, field lines connecting AR 7031 and AR 7038 belong to the QSLs computed when magnetograms from both ARs are combined. We conclude that both soft X-ray flare loops and interconnecting loops result from magnetic reconnection at the QSLs. Which of the many QSLs found in the computations are the site of magnetic reconnection depends on the magnetic field evolution. In the studied ARs we can identify three different drivers for energy release: flux emergence, photospheric displacements of the polarities and nearby magnetic reconnection. This last process leads to sympathetic flaring and to the brightness enhancement of the interconnecting arc.

Registro:

Documento: Artículo
Título:Magnetic reconnection: A common origin for flares and AR interconnecting arcs
Autor:Bagalá, L.G.; Mandrini, C.H.; Rovira, M.G.; Démoulin, P.
Filiación:Max Planck Institut für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
Instituto de Astronomía y Física del Espacio, IAFE, CC.67, Suc. 28, 1428 Buenos Aires, Argentina
Observatoire de Paris, DASOP, URA 2080 (CNRS), 92195 Meudon Cédex, France
Palabras clave:Methods: data analysis; Sun: flares; Sun: magnetic fields
Año:2000
Volumen:363
Número:2
Página de inicio:779
Página de fin:788
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v363_n2_p779_Bagala

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Citas:

---------- APA ----------
Bagalá, L.G., Mandrini, C.H., Rovira, M.G. & Démoulin, P. (2000) . Magnetic reconnection: A common origin for flares and AR interconnecting arcs. Astronomy and Astrophysics, 363(2), 779-788.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v363_n2_p779_Bagala [ ]
---------- CHICAGO ----------
Bagalá, L.G., Mandrini, C.H., Rovira, M.G., Démoulin, P. "Magnetic reconnection: A common origin for flares and AR interconnecting arcs" . Astronomy and Astrophysics 363, no. 2 (2000) : 779-788.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v363_n2_p779_Bagala [ ]
---------- MLA ----------
Bagalá, L.G., Mandrini, C.H., Rovira, M.G., Démoulin, P. "Magnetic reconnection: A common origin for flares and AR interconnecting arcs" . Astronomy and Astrophysics, vol. 363, no. 2, 2000, pp. 779-788.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v363_n2_p779_Bagala [ ]
---------- VANCOUVER ----------
Bagalá, L.G., Mandrini, C.H., Rovira, M.G., Démoulin, P. Magnetic reconnection: A common origin for flares and AR interconnecting arcs. Astron. Astrophys. 2000;363(2):779-788.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v363_n2_p779_Bagala [ ]