Artículo
Homologous flares and magnetic field topology in active region NOAA 10501 on 20 November 2003
Chandra, R.; Schmieder, B.; Mandrini, Cristina Hemilse
; Démoulin, Pascal; Pariat, E.; Torok, T.; Uddin, W.
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Fecha de publicación:
03/2011
Editorial:
Springer
Revista:
Solar Physics
ISSN:
0038-0938
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present and interpret observations of two morphologically homologous flares
that occurred in active region (AR) NOAA 10501 on 20 November 2003. Both flares displayed four homologous Hα ribbons and were both accompanied by coronal mass ejections (CMEs). The central flare ribbons were located at the site of an emerging bipole in the centre of the active region. The negative polarity of this bipole fragmented in two main pieces, one rotating around the positive polarity by ≈110° within 32 hours. We model the coronal magnetic field and compute its topology, using as boundary condition the magnetogram closest in time to each flare. In particular, we calculate the location of quasi-separatrix layers (QSLs) in order to understand the connectivity between the flare ribbons. Though several polarities were present in AR 10501, the global magnetic field topology corresponds
to a quadrupolar magnetic field distribution without magnetic null points. For both flares, the photospheric traces of QSLs are similar and match well the locations of the four Hα ribbons. This globally unchanged topology and the continuous shearing by the rotating bipole are two key factors responsible for the flare homology. However, our analyses also indicate that different magnetic connectivity domains of the quadrupolar configuration become unstable during each flare, so that magnetic reconnection proceeds differently in both events
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Chandra, R.; Schmieder, B.; Mandrini, Cristina Hemilse; Démoulin, Pascal; Pariat, E.; et al.; Homologous flares and magnetic field topology in active region NOAA 10501 on 20 November 2003; Springer; Solar Physics; 269; 1; 3-2011; 83-104
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