An Observational and Theoretical Study of the Magnetic Helicity Flux

In this thesis I have worked with the quantity of solar magnetic helicity both observationally and theoretically. The aim of the observational work was to recognize the most probable origin sites of (halo) CMEs and investigate whether and how changes in magnetic helicity flux can be temporally connected to the CMEs. The target of the theoretical work was to study the magnetic helicity evolution related to the motion of magnetic bipoles inside a square initially and later a convective hexagonal cell.