Solar Physics publishes up to two Topical Issues per year that focus on areas of especially vigorous and active research. The present Topical Issue contains papers of recent results on the solar corona, as well as on the transition region and low solar wind. The majority of these papers, which were all refereed in accordance with the standards of Solar Physics, were presented in August 1999 at a workshop held in Monterey, California. The authors were offered the opportunity to present relevant parts of their contributions on an accompanying CD ROM of this Topical Issue. The Sun's magnetic field is responsible for the spectacularly dynamic and intri­ cate phenomenon that we call the corona. The past decade has seen an enormous increase in our understanding of this part of the solar outer atmosphere, both as a result of observations and because of rapid advances in numerical studies. The Yohkoh satellite has observed the Sun now for over eight years, producing spectac­ ular sequences of images that convey the complexity of the corona. The imaging and spectroscopic instruments on SOHO have added information on the cooler part of the corona. And since April of 1998 TRACE has given us very high resolution images of the 1-2 MK corona, at cadences that allow detailed observations of field oscillations, loop evolution, mass ejecta, etc.

Aspects of Three-Dimensional Magnetic Reconnection.- The Topological Behaviour of Stable Magnetic Separators.- Does Magnetic Flux Submerge at Flux Cancelation Sites?.- Magnetic Reconnection as the Cause of a Photospheric Canceling Feature and Mass Flows in a Filament.- Forward Modeling of the Coronal Response to Reconnection in an X-Ray Bright Point.- Different Spatial Structures between Network Regions and Active Regions Indicated by TRACE 171 Å Observation.- The Global Dynamics of the High-Temperature Corona.- CME Associated with Transequatorial Loops and a Bald Patch Flare.- Long-Lived Coronal Loop Profiles from TRACE.- Inclination of Large Coronal Loops Observed by TRACE.- Structure and Dynamics of Interconnecting Loops and Coronal Holes in Active Longitudes.- Counter-Streaming Mass Flow and Transient Brightening in Active Region Loops.- High-Resolution Observations of Plasma Jets in the Solar Corona.- Dynamics of Polar Plumes Observed at the 1998 February 26 Eclipse.- Coronal Heating Events in High-Cadence TRACE Data.- Do EUV Nanoflares Account for Coronal Heating?.- Time Variability of EUV Brightenings in Coronal Loops Observed with TRACE.- Flares in Sigmoidal Coronal Structures - A Case Study.- Post-Impulsive-Phase Acceleration in a Wide Range of Solar Longitudes.- Radio versus EUV/X-Ray Observations of the Solar Atmosphere.- Non-Uniqueness of Atmospheric Modeling.- Calibrated H i Lyman ? Observations with TRACE.- Measuring the Physical Properties of the Solar Corona: Results from SUMER/SOHO and TRACE.- Observations of Transition Region Plasma.- What is Moss?.- Dynamics of Transition Region 'Moss' at High Time Resolution.- On the Sunspot Transition Region.- Variations of Photospheric Magnetic Field Associated with Flares and CMEs.- Observations of a Propagating Disturbance in TRACE.- Ion Cyclotron Waves, Instabilities and Solar Wind Heating.