Combined analysis of the 15-16 May, 1997, magnetic cloud and of its solar source region

NAKWACKI, M.S.; ATTRILL, G.; DASSO, S.; MANDRINI, C.H.; VAN DRIEL-GESZTELYI, L.; HARRA, L.K.; WANG, J.

Capilla del Monte, Córdoba, Argentina

Congreso; 49 Reunión de la Asociación Argentina de Astronomía; 2006

In this work we analise the structure of the magnetic cloud (MC) observed  by Wind between 15-16 May 1997, and the related solar event, a long duration C1.3 flare which ocurred on 12 May 1997. This event presented two dark regions in EUV (dimmings) with asymmetric evolution. The magnetic structure of the MC was modeled using three cylindrical helicoidal models, considering the asymmetry between its front and its final part. We calculate the magnetic flux in the dimmings and their evolution, and the flux through the surface perpendicular to the cloud axis and to the azimuthal direction. Finally, we compare the total flux of both, MC and dimmings, and propose a topological model for the solar event.