[Todos] IAFE-Coloquio: "INTERACTION OF INTERPLANETARY CMEs WITH THE SOLAR WIND"]

[difusion en iafe.uba.ar]

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                   PRÓXIMO COLOQUIO DEL IAFE
                Instituto de Astronomía y Física del Espacio
                          CONICET-UBA
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          "INTERACTION OF INTERPLANETARY CMEs WITH THE SOLAR WIND"

                MIERCOLES 6 de MAYO de 2009, a las 14:00 hs
                Aula del Edificio IAFE- Ciudad Universitaria

                           Dr. Pascal Demoulin
                         Observatoire de París
                                Francia
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Resumen:
Interplanetary Coronal Mass Ejections (ICMEs) are formed of plasma and
magnetic field launched from the Sun typically at faster speed than the
Solar Wind (SW). These coherent magnetic structures, frequently formed by
a flux rope, interact strongly with the SW. Such interaction is reviewed
by comparing the results obtained from in situ observations and numerical
simulations. Like fast ships in the sea, fast ICMEs drive an extended
shock in front. However, their interaction with the SW is much more
complex than that of the ship analogy. For example, as they expand in all
directions while traveling away from the Sun, a sheath of SW plasma and
magnetic field accumulates in front, which partially reconnects with the
ICME magnetic field. Furthermore, not only ICMEs have a profound impact on
the heliosphere, but the type of SW encountered by an ICME has an
important impact on its evolution (e.g. increase of mass, global
deceleration, lost of magnetic flux, distortion of the configuration).