DR. HENK SPRUIT

Accretion onto a star with a strong magnetic field has been a topic for several decades. In a wide the range of object classes the interpretation of the radiation spectra and time variations observed has been hampered by the complicated nature of the magnetohydrodynamics of the accretion process. Views that have dominated the literature will be discussed, major problems they encounter identified, and (partially) improved upon. Aspects affected are nature of the disk-magnetosphere coupling, the role of 'propellering', and the interpretation of recent numerical results.