The conversion of energy generated in the Sun's interior creates its hot corona and a wealth of dynamical phenomena such as ?ares, mass ejections and tr- sientnonthermalpopulationsofchargedparticles. Theseprocessesareofgeneral interest in astrophysics. In the case of the Sun they can be probed by a unique combination of imaging, spectrographic and in situ measurements. Radio obs- vations provide important diagnostics, and many instruments are operated by small research groups in Europe. The stimulation of joint investigations using radio diagnostics is a major role of CESRA, the Community of...