RadCube (led by C3S with MTA EK in Hungary, Imperial College London in UK, and Astronika in Poland): a 3-unit CubeSat mission to demonstrate miniaturised instrument technologies that measure in-situ the space radiation and magnetic field environment in Low Earth Orbit for space weather monitoring purposes. The platform developed by C3S will also be demonstrated in flight. The project is currently in the preliminary design phase and planned to be ready for flight in late 2019.