Continuum radio emission and fine structure (in particular millisecond spikes) have recently raised interest as diagnostic tools for the interpretation of energy release and particle acceleration in flares. In the circles of the European solar radio astronomers, loosely organized in CESRA, the idea of a workshop came up intended for active observers of the impulsive phase of flares in radio and associated emissions. The scientific organizing committee included A.D. Benz (chairman), A. Magun, M. Pick, G. Trottet, and P. Zlobec. The workshop was held on May 27-31, 1985 in the castle of Duino near Trieste, Italy. The meeting intended to find a common terminology, to compare radio observations with measurements in other emissions and to confront observations with theoretical concepts. We have achieved a representative summary on the current status of the field and a clear perspective for the next cycle. This volume contains the reviews and a selection of contributions and extended abstracts of papers presented at the workshop. I wish to thank the local organizers, in particular A. Abrami, M. Comari, F. Depolli, L. Fornasari, M. Messerotti (chairman), M. Nonino, and P. Zlobec. Financial support was graciously provided by the Italian Research Council (CNR). Most of all, however, I would like to express my thankfulness to our host, His Highness Prince Raimondo della Torre e Tasso, for his invaluable hospitality. We are deeply sorry to hear of his passing in the meantime. To his memory these proceedings are dedicated.
`... the book ought to become the basis for a common terminology in the field of fine structure or radio continua. Therefore, the book is strongly recommended to specialists in solar physics.'
Space Science Reviews, 45 (1987)
Session I: Overview on Radio Continua During Flares.- MHD Theories of Solar Flares (Invited Review).- Observations of Radio Continua and Terminology (Invited Review).- The Relation between Flare-Related Metric Continuum Bursts and Coronal Mass Ejections.- Discussion on the Classification of Fine Structure in Continua (Report).- Session II: Fine Structure in Continua.- On Fast Pulsations in Flare Continua.- Exponential Decay and Exciter Profile of Fast Pulses in Type IV Events.- The Polarization of Decimetric Pulsations.- Session III: Coronal Environment of Radio Emission.- Interplanetary Phenomena and Solar Radio Bursts (Invited Review).- Electron-Cyclotron Maser Emission from the Sun and Stars: Variations with Plasma Temperature and Density.- Session IV: Radio Millisecond Spikes.- Millisecond Radio Spikes (Invited Review).- The Characteristics of Type IV-Associated Spikes at Metric Wavelengths..- The Microwave Spectrum of Solar Millisecond Spikes.- Occurrence of Solar Decimetric Spike Bursts over a Period of 4 Years during the 21st Cycle.- Hollow Beam Distribution of Energetic Electrons and Higher Harmonics of Electron Cyclotron Maser.- A Model of Ultra-Fast Fine Structures of Microwave Bursts.- Session V: Timing of Radio Emission in Relation to Other Flare Radiation.- Relative Timing of Hard X-Rays and Radio Emissions during the Different Phases of Solar Flares: Consequences for the Electron Acceleration (Invited Review).- Radio Observations of the Solar Neutron Flare of June 3, 1982.- Behaviour of the Polarization at dm-m Wavelengths during the Evolution of Five Two-Ribbon Flares.- Type IV Bursts and Coronal Mass Ejections.- Electron Acceleration in Flares Inferred from Radio and Hard X-ray Emissions.- Images of Post-Flare Coronal Structures in X-Rays (Extended Abstract).- Interpretation of Temporal Features in an Unusual X-Ray and Microwave Burst.- Discussion on new Technologies for the next Solar Cycle.- Solar VLBI of Compact Transient Sources (Invited Review).- Session VI: Synchrotron Emission.- Gyrosynchrotron Emission of Solar Flares (Invited Review).- Decimeter Continuum Radio Emission from a Post-Flare Loop (Extended Abstract).- Flare Stars and Solar Bursts: High Resolution in Time and Frequency.- Can Observed Hard X-Ray and Microwave Flux from Solar Flares Be Explained by a Single Electron Population?.- Microwave Diagnostics of Energetic Electrons in Flares.- Comments on Fast Pulses in mm-Wave Bursts.- Announcement.