Reviews in Modern Astronomy

Convection, Spontaneous Discontinuities, and Stellar Winds and X-Ray Emission.- The Sun as a Prototype in the Study of Stellar Magnetic Activity.- Hydrodynamics of the Solar Photosphere: Model Calculations and Spectroscopic Observations.- Solar Spectroscopy with a 100 x 100 Diode Array.- Solar Research at Potsdam: Papers on the Structure and Dynamics of Sunspots.- Time-Resolved Stokes V Polarimetry of Small-Scale Magnetic Structures on the Sun.- Instabilities in Astrophysical Shear Flows.- Simultaneous Observations with a Tunable Filter and the Echelle Spectrograph of the Vacuum Tower Telescope at Tenerife.- Aspects of the Present Heliospheric Research.- Turbulence in the Solar Wind.- Dust Rings Around Planets.- Asteroid-Asteroid Interactions - Dynamically Irrelevant?.- First Results from the X-Ray Astronomy Mission ROSAT.- TYCHO/HIPPARCOS A Successful Mission! First Results and Further Improvements.- Shock Waves in Accretion Disks.- Magnetic Field Measurements on Cool Stars.- The Expanding Envelope of Supernova 1987A in the Large Magellanic Cloud.- Dynamos in Galaxies.- Index of Contributors.