[Todos] CICLO DE COLOQUIOS CIENTIFICOS: Miércoles 18 de junio de 2014 a las 14hs.

["Area Difusión IAFE"]

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                   CICLO DE COLOQUIOS CIENTÍFICOS
                        ¿Qué se investiga en el IAFE?
                  Instituto de Astronomía y Física del Espacio
                                CONICET-UBA

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"A 3D hybrid simulation model describing plasma-neutral interaction for
solar system objects - illustration for Mars."

                                 Ronan Modolo
                  LATMOS (CNRS, UVSQ, UPMC) Guyancourt, Francia
                  Miércoles 18 de Junio de 2014 a las 14:00 hs.
                           Aula del Edificio IAFE

Solar wind or magnetospheric plasma interacts efficiently with the neutral
environment of weakly magnetized solar system objects (or with a confined
magnetosphere), it contributes to the erosion of the gaseous envelope and
concurs to the atmospheric dynamic. The electromagnetic coupling with the
neutral environment takes place with ionization processes which act as a
catalyzer. A modeling effort has been conducted to parallelize a
multi-species hybrid simulation code. This code now provides a kinetic
description of the ions with a rather improved spatial resolution (smaller
than the ion inertial length). The latest progresses are reported for the
Martian application and simulations results with a uniform high spatial
resolution are presented. This fully parallelized code describes both the
dynamics and physical and chemical processes involved in the interaction.
Photoproduction, charge exchange and electron impact ionization are
computed dynamically through the simulation domain. The Martian ionosphere
can be described either by external profile; e.g. by coupling with
the result of ionosphere-exosphere simulations; or internally
computed profiles obtained by assuming an equilibrium between several
chemical processes (in which case transport is neglected).
Our simulation archive is interoperable with VO-tools and can be used to
directly compare observations with simulation. Illustrations for different
objects will also be shown.