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.