Hard X-ray and metric/decimetric spatially resolvedobservations of the 10 April 2002 solar flare Original Research Article

The GOES M8.2 flare on 10 April 2002 at ∼ 1230 UT was observed at X-ray wavelengths by RHESSI and atmetric/decimetric wavelengths by the Nançay Radioheliograph (NRH). We discuss the temporal evolution of X-ray sources together with the evolution of the radio emission sites observed at different coronal heights by the NRH. While the first strong HXR peak at energies above 50 keV arises from energy release in compact magnetic structures (with spatial scales of a few 104 km) and is not associated with strong radio emission, the second one leads to energy release in magnetic structures with scales larger than 105 km and is associated with intense decimetric/metric and dekametric emissions. We discuss these observations in the context of the acceleration sites of energetic electrons interacting at the Sun and of escaping ones.