Structures 3D et CMEs: observations STEREO

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Abstract

Three-dimensional information on Coronal Mass Ejections (CMEs) and coronal shocks can be obtained from a wide range of in-situ measurements and remote-sensing techniques. Extreme ultraviolet (EUV) and white-light imaging sensed from several vantage points can be used to infer the 3-D geometry of the different parts that constitute a CME. High-resolution and high-cadence coronal imaging provides detailed information on the formation and release phase of a magnetic flux rope, the lateral expansion of the CME and the reconfiguration of the corona associated with the effects of pressure variations and reconnection. The evolution of the CME in the interplanetary medium and the connection of its various substructures with in-situ measurements can be obtained from multi-point heliospheric imaging. The derivation of the 3-D structure of CMEs and their shocks provides constraints for the theories developped to interpret the origin of the kinetic energy of CMEs and the associated energetic particles (SEPs).