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We study a solar flare that occurred on September 10, 2002, in active regionNOAA 10105 starting around 14:52 UT and lasting approximately 5 minutes in theradio range. The event was classified as M2.9 in X-rays and 1N in H\alpha.Solar Submillimeter Telescope observations, in addition to microwave data giveus a good spectral coverage between 1.415 and 212 GHz. We combine these datawith ultraviolet images, hard and soft X-rays observations and full-diskmagnetograms. Images obtained from Ramaty High Energy Solar SpectroscopicImaging data are used to identify the locations of X-ray sources at differentenergies and to determine the X-ray spectrum, while ultra violet images allowus to characterize the coronal flaring region. The magnetic field evolution ofthe active region is analyzed using Michelson Doppler Imager magnetograms. Theburst is detected at all available radio-frequencies. X-ray images (between 12keV and 300 keV) reveal two compact sources and 212 GHz data, used to estimatethe radio source position, show a single compact source displaced by 25" fromone of the hard X-ray footpoints. We model the radio spectra using twohomogeneous sources, and combine this analysis with that of hard X-rays tounderstand the dynamics of the particles. Relativistic particles, observed atradio wavelengths above 50 GHz, have an electron index evolving with thetypical soft-hard-soft behaviour.

A burst with double radio spectrum observed up to 212 GHz