INVESTIGADORES
MANDRINI Cristina Hemilse
congresos y reuniones científicas
Título:
Dynamics of an active region and associated events
Autor/es:
LUONI, M.L.; LÓPEZ FUENTES, M.C.; FERNÁNDEZ BORDA, R.A.; MANDRINI, C.H.; ROVIRA, M.G.
Lugar:
Villa Elisa
Reunión:
Congreso; 48 Reunión Anual de la Asociación Argentina de Astronomía; 1998
Institución organizadora:
Asociación Argentina de Astronomía
Resumen:
We study the evolution of the magnetic field of an active region (NOAA 7070) where several flares of different importance happened. We analyze a 3B/X3 flare on 27 February 1992 and a SF/C4.3 on 28 February. Magnetograms obtained after the 3B/X3 flare show a global decrease of the intensity and of the shear of the magnetic field. Both events can be associated to the fast divergent motions of parasitic spots, having a drift velocity of 220 km/seg measured with respect to the most stable preceding spot. In order to analyze the response of the coronal plasma to the evolution of the photospheric field, we study the morphology of the soft X-ray emission (Soft X-Ray Telescope, SXT aboard the Yohkoh spacecraft) and compare it with the coronal magnetic field lines computed from a model of the observed field.
