IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The link between CME-associated dimmings and interplanetary magnetic clouds
Autor/es:
MANDRINI, C.H.; NAKWACKI, M.S.; ATTRILL, G.; VAN DRIEL-GESZTELYI, L.; DASSO, S.; DÉMOULIN, P.
Lugar:
Ioannina, Grecia
Reunión:
Simposio; IAU Symp. 257: Universal Heliophysical Processes; 2008
Institución organizadora:
International Astronomical Union
Resumen:
Coronal dimmings often develop in the vicinity of erupting magnetic configurations. It has been suggested that they mark the location of the footpoints of ejected flux ropes and, thus, their magnetic flux can be used as a proxy for the ejected flux. If so, this quantity can be compared to the flux in the associated interplanetary magnetic cloud (MC) to find clues about the origin of the ejected flux rope. In the context of this interpretation, we present several events for which we have done a comparative solar-interplanetary analysis. We combine SOHO/Extreme Ultraviolet Imaging Telescope (EIT) data and Michelson Doppler Imager magnetic maps to identify and measure the flux in the dimmed regions.We model the associated MCs and compute their magnetic flux using in situ observations. We find that the magnetic fluxes in the dimmings and MCs are compatible in some events; though this is not the case for large-scale and intense eruptions that occur in regions that are not isolated from others. We conclude that, in these particular cases, a fraction of the dimmed regions could be formed by reconnection between the erupting field and the surrounding magnetic structures, via a stepping process that can explain other CME associated events.in situ observations. We find that the magnetic fluxes in the dimmings and MCs are compatible in some events; though this is not the case for large-scale and intense eruptions that occur in regions that are not isolated from others. We conclude that, in these particular cases, a fraction of the dimmed regions could be formed by reconnection between the erupting field and the surrounding magnetic structures, via a stepping process that can explain other CME associated events.