Observed flux density enhancement at submillimeter wavelengths during an X1.2 flare

CRISTIANI, G.D.; GIMÉNEZ DE CASTRO, C.G.; LUONI, M.L.; MANDRINI, C.H.; ROVIRA, M.G.; KAUFMANN, P.; MACHADO, M.E.

Beijing

Congreso; 36th COSPAR Scientific Assembly; 2006

COSPAR

We analyze the October 30 2004 X1 2 SF solar event that ocurred in AR 10691 N13 W18 at 11 38 UT Observations at 212 and 405 GHz of the Solar Submillimeter Telescope SST with high time resolution 5 ms show an intense impulsive burst followed by a long-lasting thermal phase EUV images from the Extreme Ultraviolet Imaging Telescope were used to identify the possible emitting sources Radio Solar Telescope Network RSTN data complement our spectral observations below 15 GHz During the impulsive phase the turnover frequency is above 15 4 GHz and the parameters of the emitting electrons are determinated using the gyrosynchrotron codes developed by Ramaty Ramaty et al 1994 dagger We model the coronal magnetic field of the active region using the Michelson Doppler Imager MDI magnetograms as boundary condition This model allows us to explain the event in terms of a magnetic reconnection process The long-lasting phase following the impulsive burst is analyzed in terms of thermal emission its shape is compared with GOES soft-X ray observations. Ramaty R Schwartz R A Enome S Nakajima H 1994 em Gamma-ray and millimeter-wave emissions from the 1991 June X-class solar flares Astrophysical Journal 436 941-949