Dynamical models to describe magnetic clouds in expansion

NAKWACKI, M.S.; DASSO, S.; MANDRINI, C.H.; DÉMOULIN, P.; ELLIOT, H.

Mérida

Congreso; VIII Conferencia Latinoamericana de Geofísica Espacial (VIII COLAGE);; 2007

Asociación Latinoamericana de Geofísica Espacial

Magnetic clouds (MCs) are the interplanetary counterpart of coronal mass ejections (CMEs). They transport the magnetic flux and helicity released by CMEs into the interplanetary medium. At 1 AU from the Sun, the magnetic structure of a MC is generally modelled as a static flux rope, i.e., considering it as a rigid body travelling in the solar wind. However, in some cases, a cloud can be also modelled as an expanding magnetic structure if its velocity profile presents clear signatures of expansion when observed by a spacecraft. We present here a diferent models to describe the magnetohydrodynamic evolution of interplanetary coronal mass ejections and magnetic clouds in the interplanetary medium.