  With its Planetary Space Weather Service (PSWS), the Europlanet-H2020
Research Insfrastructure (EPN2020RI) project is proposing a compelling set of
databases and tools to that provides Space Weather forecasting throughout the
Solar System. We present here the selected event transfer system (VOEvent). We
describe the user requirements, develop the way to implement event alerts, and
chain those to the 1) planetary event and 2) planetary space weather
predictions. The service of alerts is developed with the objective to
facilitate discovery or prediction announcements within the PSWS user community
in order to watch or warn against specific events. The ultimate objective is to
set up dedicated amateur and/or professional observation campaigns, diffuse
contextual information for science data analysis, and enable safety operations
of planet-orbiting spacecraft against the risks of impacts from meteors or
solar wind disturbances.
