The Sun's global corona in 3D

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Solar Missions, Solar Corona, Solar Wind

Scientific paper

The Solar Orbiter will perform the first out-of-ecliptic and the first heliosynchronous observations of the solar corona, thus allowing unique science investigations. Co-rotation will freeze for many days the corona in the plane of the sky, and this will ensure the most favourable conditions to investigate the evolution of coronal structures. For instance, the study of the evolution of coronal streamers is essential to determining the role of magnetic reconnection as one of the possible processes leading to the formation of the slow wind. On the other hand, the study of the evolution of elemental compositon in streamers will provide insight in the processes of gravitational settling and dynamic fractionation that may occur within a streamer. The out-of-ecliptic observations will allow for the first time a unique view of the low-latitude and equatorial coronal plasma and solar wind. These observations are essential to measuring the longitudinal extent of streamers and mass ejections and to determining the mass and magnetic flux carried by plasmoids and eruptions in the heliosphere.

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