IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ejective events from a complex active region
Autor/es:
MANDRINI, C.H.; CHANDRA, R.; PARIAT, E.; SCHMIEDER, B.; DéMOULIN, P.; TOROK, T.; UDDIN, W.
Lugar:
Bremen
Reunión:
Congreso; 38th COSPAR Scientific Assembly; 2010
Institución organizadora:
Committee on Space Research
Resumen:
On 18 and 20 November 2003 active region (AR) 10501 produced a series of M flares all of them associated with coronal mass ejections (CMEs). The particularity of this AR is that while observational tracers of the magnetic helicity sign indicate that the large scale field in the region had a negative magnetic helicity sign, the MC associated to the most intense flare/CME on November 18 showed the opposite sign. Furthermore, the filaments observed on November 20 present morphological characteristics that correspond to a negative magnetic helicity sign, the rotation of the polarities of an emerging bipole indicate negative magnetic helicity sign injection; however, the flare ribbons observed after two homologous events can be connected either by field lines computed using a positive or a negative helicity sign magnetic field. We combine Há, EUV, hard X-rays, and magnetic field data analysis with magnetic field modelling, and magnetic helicity injection computations to understand the origin of the helicity sign discrepancies discussed above. On November 20 magnetic field modeling and topology computations (in particular, the location of quasi-separatrix layers in relation to flare ribbons and evolution) give us clues about the CME initiation process.