IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A combined analysis of the magnetic cloud on 15-16 May 1997 and its solar source region
Autor/es:
NAKWACKI M.S.; ATTRILL G.; DASSO S.; MANDRINI C.H.; VAN DRIEL-GESZTELYI L.; HARRA L.K.; WANG, J.
Lugar:
Beijing, China
Reunión:
Conferencia; 6th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in Beijing, China.; 2006
Institución organizadora:
COSPAR
Resumen:
Coronal Mass Ejections CMEs are the most important short-lived agents that transport magnetic flux from the Sun to the interplanetary medium Thus detailed studies of the solar sources of CMEs and the associated magnetic clouds MCs are an important key to understand and constrain solar and interplanetary models We analyze the magnetic structure of the MC observed on 15-16 May 1997 by the spacecraft Wind and its associated solar event a C1 3 long duration event that occurred on 12 May 1997 in AR8038 Two main dimming regions that exhibit an asymmetric temporal and spatial evolution were observed in association with this event We compute the magnetic flux in the dimmings and follow its evolution using magnetograms from the Michelson Doppler Imager SoHO MDI The MC structure is inferred using three different helical cylindrical models with a significantly different radial twist distribution We also take into account the asymmetry observed between the front and the rear part of the cloud We fit the free parameters of each model comparing models with in situ observations Then we estimate the flux across the surface perpendicular to the axis of the cylinder and the flux across the surface formed by this axis and the cloud radial direction Finally we compare the MC total flux with that corresponding to both observed dimmings By combining our interplanetary measurements and the dimmings flux evolution we propose a topological model for the 12 May eruptive event