The present volume colleets the review and contributed papers presented at the Europhysics Study Conferenee "Acere­ tion Disks and Magnetie Fields in Astrophysies" held in Noto, Sicily, Italy, from 16 to 21 June 1988, under the High Patronage of the President of the Italian Republie and the 10ea1 patronage of the Cent ro di Studi Superiori e di Rieer­ ehe (Center for Advaneed Study and Research), a seientific institution supported by the City of Nota and the Oniversity of Catania. The attendanee to the Conferenee was limited to about fifty seleeted partieipants from Canada, China, Denmark, Franee, Germany F.R., Italy, Japan, the Netherlands, Spain, Sl~itzerland. Onited Kingdom and Onited States, in order to give the meeting the character and appearance of areal lolorkshop, whose main aim was to highl ight a varied but same wh at uni fied picture of the interact ion, in di fferent astrophysical systems, of rotation, turbulenee and magnetism, with speeifie referenee to aeeretion disks.

The Relevance of Magnetic Fields to Stars and Accretion Disks.- Dynamo Processes in Stars.- The Nonlinear Breakup of the Sun's Toroidal Field.- Nonlinear Rossby-Alfven Global Waves on the Surface of a Rotating Sphere.- Accretion Discs in Theory and Practice.- Instabilities in Dwarf Nova Accretion Disks.- Accretion and Particle Acceleration by Spiral Shock Waves.- Magnetohydrodynamic Flows in Accretion Disks and Jets.- Slender Fluxtubes in Accretion Disks.- Magnetic Fields in the Accretion Disks of Cataclysmic Variables.- Accretion Discs and Magnetic Cataclysmic Variables.- Radio Emission of Dwarf Novae.- Jets and Magnetic Fields.- Hydromagnetic Flows from Rapidly Rotating Compact Objects and the Formation of Relativistic Jets.- Three Dimensional Simulation of Accretion Disks with Smoothed Particle Hydrodynamics.- The Early Stages of Star Formation.- Accretion Disks and Jets in Protostellar Systems.- Massive Cloud of Active Star Formation and the Spinning Streamer as Angular Momentum Drain.- Monte Carlo Simulation of H2 Formation by Cosmic Rays: Effect of the Grain Model.- Magnetic Field Generation during Galaxy Formation.- Numerical Simulation of Weakly Magnetized Propagating Slab Jets.- Numerical Simulation of Mass Outflows from Star Forming Regions.- Outflows from Active Galactic Nuclei.- Formation of Radio Jets and Lobes, and Enhanced Energy Liberation at AGN's.- Relativistic Radiative Transfer using Moment Formalism.- Fluid Models for Relativistic Warm Plasmas.- Magnetic Fields in the Central Engines of Active Galactic Nuclei.- Time Variability of the X-Ray Emission from Seyfert Galaxies.- Slim Accretion Discs.- Summary of the Conference: Stars.- Conference Summary: Active Galactic Nuclei.