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Schmieder, B.; Mandrini, C.H.; Démoulin, P.; Aulanier, G.; Li, H.; Berlicki, A. "What is the role of magnetic null points in large flares?" (2007) Advances in Space Research. 39(12):1840-1846
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Abstract:

We have performed the analysis of the magnetic topology of active region NOAA 10486 before two large flares occurring on October 26 and 28, 2003. The 3D extrapolation of the photospheric magnetic field shows the existence of magnetic null points when using two different methods. We use TRACE 1600 Å and 195 Å brightenings as tracers of the energy release due to magnetic reconnections. We conclude on the three following points:1.The small events observed before the flares are related to low lying null points. They are long lasting and associated with low energy release. They are not triggering the large flares.2.On October 26, a high altitude null point is found. We look for bright patches that could correspond to the signatures of coronal reconnection at the null point in TRACE 1600 Å images. However, such bright patches are not observed before the main flare, they are only observed after it.3.On October 28, four ribbons are observed in TRACE images before the X17 flare. We interpret them as due to a magnetic breakout reconnection in a quadrupolar configuration. There is no magnetic null point related to these four ribbons, and this reconnection rather occurs at quasi-separatrix layers (QSLs). We conclude that the existence of a null point in the corona is neither a sufficient nor a necessary condition to give rise to large flares. © 2007 COSPAR.

Registro:

Documento: Artículo
Título:What is the role of magnetic null points in large flares?
Autor:Schmieder, B.; Mandrini, C.H.; Démoulin, P.; Aulanier, G.; Li, H.; Berlicki, A.
Filiación:Observatoire de Paris, LESIA, UMR 8109 (CNRS), 92195 Meudon, Cedex Principal, France
Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Purple Mountain Observatory, Nanjing, 210008, China
Astronomical Institute, the Wrocław University, ul.Kopernika 11, 51-622 Wrocław, Poland
Palabras clave:flares; magnetic fields; Magnetic reconnection; Sun; X-rays; 3D extrapolation; Magnetic null points; Magnetic topology; Quasi-separatrix layers; Magnetic fields; Space research; X rays; Topology
Año:2007
Volumen:39
Número:12
Página de inicio:1840
Página de fin:1846
DOI: http://dx.doi.org/10.1016/j.asr.2007.03.058
Título revista:Advances in Space Research
Título revista abreviado:Adv. Space Res.
ISSN:02731177
CODEN:ASRSD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v39_n12_p1840_Schmieder

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Citas:

---------- APA ----------
Schmieder, B., Mandrini, C.H., Démoulin, P., Aulanier, G., Li, H. & Berlicki, A. (2007) . What is the role of magnetic null points in large flares?. Advances in Space Research, 39(12), 1840-1846.
http://dx.doi.org/10.1016/j.asr.2007.03.058
---------- CHICAGO ----------
Schmieder, B., Mandrini, C.H., Démoulin, P., Aulanier, G., Li, H., Berlicki, A. "What is the role of magnetic null points in large flares?" . Advances in Space Research 39, no. 12 (2007) : 1840-1846.
http://dx.doi.org/10.1016/j.asr.2007.03.058
---------- MLA ----------
Schmieder, B., Mandrini, C.H., Démoulin, P., Aulanier, G., Li, H., Berlicki, A. "What is the role of magnetic null points in large flares?" . Advances in Space Research, vol. 39, no. 12, 2007, pp. 1840-1846.
http://dx.doi.org/10.1016/j.asr.2007.03.058
---------- VANCOUVER ----------
Schmieder, B., Mandrini, C.H., Démoulin, P., Aulanier, G., Li, H., Berlicki, A. What is the role of magnetic null points in large flares?. Adv. Space Res. 2007;39(12):1840-1846.
http://dx.doi.org/10.1016/j.asr.2007.03.058