Observations of an X1.2 flare at submillimeter wavelengths

CRISTIANI, G.; GIMÉNEZ DE CASTRO, C.G.; MANDRINI, C.H.; ROVIRA, M.G.; KAUFMANN, P.

La Plata, Buenos Aires, Argentina

Congreso; 48 Reunión de la Asociación Argentina de Astronomía; 2005

We analyze the solar event on October 30, 2004, that ocurredin active region (AR) 10691 (N13W18) at 11:38 UT. High time resolutionobservations at 212 GHz obtained with the Submillimeter Solar Telescope(SST) showed a very impulsive event (1500 s.f.u.), followed by a longlastingthermal phase. The burst was also observed at 405 GHz, thesecond observational frequency of SST. We combine SST data with theobservations of the Radio Solar Telescope Network (RSTN) to determinethe radio spectrum. This spectral analysis does not allow us to infer thepresence of the THz component seen by Kaufmann et al (2004). EUVimages from the Extreme Ultraviolet Imaging Telescope (SoHO/EIT) areused to identify the possible emitting sources. Assuming that the origin ofthe emission during the impulsive phase is gyrosynchrotron radiation frommildly relatisvistic electrons, we derive the parameters of the acceleratedelectrons and emitting source.