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We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of theSolar Submillimeter Telescope (SST), with high time resolution (5 ms), show anintense impulsive burst followed by a long-lasting thermal phase. EUV imagesfrom the Extreme Ultraviolet Imaging Telescope (SOHO/EIT) are used to identifythe possible emitting sources. Data from the Radio Solar Telescope Network(RSTN) complement our spectral observations below 15 GHz. During the impulsivephase the turnover frequency is above 15.4 GHz. The long-lasting phase isanalysed in terms of thermal emission and compared with GOES observations. Fromthe ratio between the two GOES soft X-ray bands, we derive the temperature andemission measure, which is used to estimate the free-free submillimeter fluxdensity. Good temporal agreement is found between the estimated and observedprofiles, however the former is larger than the latter.

Observed flux density enhancement at submillimeter wavelengths during an X-class flare