Séminaire LATMOS (Amphithéâtre Gérard Mégie, Guyancourt), jeudi 21 juin 2012, 11h

Orateur: Eduard Dubinin (Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany)

Titre: Ionospheric magnetic fields and currents at Mars and Venus

Résumé: Mars Express and Venus Express spacecrafts have provided us a wealth of in-situ observations of characteristics of induced magnetospheres of Mars and Venus at low altitudes during solar minimum conditions. At such conditions large-scale magnetic fields are observed deeply in the ionospheres (magnetized ionospheres). The observations again raise a long-standing question about the origin of these fields. The problem is intimately related to the issue of electric current system and their closure. Analysis of ASPERA-3, ASPERA-4, MARSIS and MAG data reveals a lot of features which require a more sophisticated view at the origin and the topology of the ionospheric magnetic fields. Differing perspectives at this problem will be discussed.