Foreword | Planetary Radio Emission as a Tool of Magnetospheric Research | The Magnetic Environment of the Known Radio Planets | Comparative Study of the "Radio - Planets" | Observations of Nightside and Dayside Auroral Kilometric Radiation with Viking | Extended Ground-based Observations of Jupiter´s Decametric Radiation | 18 MHz Interferometry of Non-Io-C L-bursts | Interferometric Observations at 16.7 and 22.2 MHz at the Observatory Lustbühel, Graz | Evidence for Beaming of Jupiter´s Decametric Radiation: Simultaneous Observations from Voyagers and Ground-based Observatories | Source Localization of Jupiter´s Io Dependent Radio Emissions | Jovian Decametric Arc Pattern and Multiple Reflection Alfvén Wave Model | Io´s Interaction with the Plasma Torus: Currents in the Alfvén Wings and Joule Heating | The Kilometric Jovian Radio Sources at the Io Torus | Jupiter´s Radio Emission and Solar Activity | Does Solar Radio Emission Trigger SKR ? | Uranus Radio Emissions | The Auroral Kilometric Radiation from Uranus and its Magnetospheric Implications | Extraordinary Mode Waves on the Resonance Cone Detected on Uranus | Planetary Scaling Laws and Predictions for Neptune | Planetary Radio Emissions from Low Magnetic Latitudes: Observations and Theories | Low Frequency Radio Waves as a Diagnostic of Thermal Plasma Density in the Jovian Plasma Sheet | Polarization Aspects from Planetary Radio Emissions | Beaming of Planetary Radio Emissions | Modulated Spectral Activity (MSA) - Implications for Planetary Radio Sources | Ray Tracing Planetary Radio Emissions | Planetary Radio Emissions from High Magnetic Latitudes: The "Cyclotron Maser" Theory | Cyclotron Maser Instability and its Applications | Planetary Radio Lasing | Time Evolution of Low Frequency Plasma Modes | References | Erratum

The first internationalWorkshop on Planetary Radio Emissions was held in the summer of 1984 at Graz, following the Twentyfifth COSPAR meeting. The enthusiastic acceptance by the scientific community in this field encouraged us to organize this second workshop. In the intervening two years, Uranus was added to the list of radio planets, and results of the Voyager 2 observations could be included in this workshop's presentations and discussions. Observational results in general, as well as theoretical aspects of source mechanisms have also received further attention. Thus, the present workshop provided an excellent opportunity to assess the current status of research in planetary radio emissions. This volume contains edited versions of the papers presented at the workshop; its publi- cation was again made possible through the generous support of the Austrian Academy of Sciences. The organizers and editors wish to acknowledge with thanks the financial support by the Austrian Space Agency (ASA), the City of Graz, the Observatory of Paris, the Provincial Government of Styria, and to thank the University of Graz for hosting this workshop. In 1989 the flyby of Voyager 2 at Neptune will probably add another planet to the list of radio planets. Thus, following an appropriate time interval, a new assessment of all known radio planets may be in order and with it a third workshop to follow the already established tradition.  

Bent M. Pedersen

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Planetary Radio Emissions II