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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.

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