Dr. 

Foreword | Jovian Radio Emissions: An Early Overview of Galileo Observations | Galileo Radio and Plasma Wave Observations at Jupiter: An Invited Overview | Jupiter´s Low-Frequency Radio Spectrum: Filling in the Gaps | Recent Results by the University of Florida Group from Low Frequency Radio Observations of Jupiter and Neptune | A New Determination of Jupiter´s Radio Rotation Period | On the Origin of Jovian Decameter Radio Bursts | Recurrent Fine Structures in Jovian S-Burst Emission | The Contribution of the Riihimaa Classification to the Study of Jovian Millisecond Radio Bursts | Ground-Based High Sensitivity Radio Astronomy at Decameter Wavelengths | Jovian Decametric Eclipses by the Galilean Satellites | Polarization of Jupiter´s Decametric Radio Bursts | Propagation Effects Influencing the Observed Polarization of the Jovian Decametric Emission | Radio Emissions from Filamentary Sources: A Simple Approach | The Structure of the Io Plasma Torus after Ulysses Encounter | Atomic and Molecular Emissions from Jupiter´s Poles | Slow Magnetic Rotator in a Collisionless Plasma: Towards the Theory of Magnetospheres | A Search for Decametric Wavelength Radio Emission from the Collision of Comet S-L 9 with Jupiter | Understanding Jupiter´s Radiation Belts through Observation and Modeling | Jupiter´s Synchrotron Radiation: Observed Variations before, during and after the Impacts of Comet SL-9 | Modifications of the Synchrotron Radiation Belts of Jupiter two Years After the Collision with Coment SL9 | Terrestrial Non-Thermal Continuum Radiation: Wind Observations | Observations of Low Frequency Terrestrial Type III Bursts by Geotail and Wind and their Association with Isolated Geomagnetic Disturbances Detected by Ground and Space-Borne Instruments | Terrestrial LF Bursts: Source and Solar Wind Connection | Possible Stimulated AKR Observed in Galileo, DE-1 and Polar Wideband Data | The Observations of the Subauroral Nonthermal Radio Emission by AKR-X Receiver on Board of the Interball Satellite | Review of Recent Ground-Level Observations of Terrestrial Auroral Radio Emissions | Further Investigation of Auroral Roar Fine Structure | Terrestrial F-Region Cyclotron Maser Theory | Transionospheric Propagation Studies: Novel Data Sources | Radiophysical Aspects of the ´Warning´ Project | Re-visiting Saturnian Kilometric Radiation with Ulysses/URAP | Experimental and Theoretical Investigations on the Cassini RPWS Antennas | Electromagnetic Wave Direction Finding as Useful Tool for Analyzing Planetary Radio Emissions: Which Information can be Obtained? | New Digital Spectrometers for Ground Based Decameter Radio Astronomy | Automatic Recognition of Low Frequency Radio Planetary Signals | The Effects of Interplanetary Scattering on Radio Observations of Jupiter at very Low Frequencies | Heliospheric Radio Emission Theory | Electron Acceleration at Coronal and Interplanetary Shock Waves | Propagation of Particle Beams in Solar Coronal Magnetic Field Structures | Radio Emission Associated with Mass Ejection Events from Active Regions of the Sun - Event of 1992 August 5 | A Fly Off of the Fast Electron Flows Generating Type III Bursts | New Features in Type IV Solar Radio Emission: Combined Effects of Plasma Wave Resonances and MHD Waves | On the Origin of Decimetric -Wave Continuum of Solar Flares | Nonlinear Analysis of Solar Radio Events: A Preliminary Approach | Very Low Frequency Astrophysics from the Moon | Conference Summary | References

When we organized the first International Workshop on Planetary Radio Emissions in the summer of 1984, following the 25th COSPAR meeting held at Graz, we hardly expected this workshop to become somewhat of a tradition. The enthusiastic acceptance by the relatively small but highly active community led us to hold the second one in September 1987 and the third workshop in 1991. The intimate size of the workshop with enough time for discussions and social get-togethers formed a close bond among the members of this community over the years. There has been a continuing growth in subjects discussed at these workshops. Whereas the first one concentrated on the first radio planet, Jupiter, it also dealt with Earth and initial results of Saturn. By the second and third workshop Uranus and Neptune had joined the radio planets in our solar system as the results of the Voyager 2 fly-by of these planets. The most recent fourth workshop held in September 1996 expanded the themes concerned with all five radio planets by adding new results from the Galileo und Ulysses missions. The proceedings of these workshops appeared in bookform under the title Planetary Radio Emissions; the present one is the forth volume (PRE IV) appearing in the "Silver Series" of the Austrian Academy of Sciences Press. Like the previous three volumes the present one is also expected to become a "standard" in this discipline, containing the most-up- to-date state of knowledge in theory and observation of planetary radio emissions. We hope that this volume, as the previous ones, will become the compendium in this field until new observations and ideas might urge us to convene another Graz-Workshop.  

Alain Lecacheux

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Planetary Radio Emissions IV