Radio Observations of the December 20 th, 2002, flare.

G. CRISTIANI , I. DE BENEDETTO E SILVA , C.G. GIMÉNEZ DE CASTRO , C.H. MANDRINI , M.G. ROVIRA Y P. KAUFMANN

Coimbra, Portugal

Congreso; The Physics of Chromospheric Plasmas; 2006

Astronomical Observatory of the University of Coimbra (Coimbra, Portugal)

In this work we analyzed the December 20 th, 2002 event which took place in the active region AR10226 (S26 W32) at 13:16 UT.We obtained a particular spectrum at 212 GHz from the Solar Submillimeter Telescope (SST) together with the microwave data from the Radio Solar Telescope (RSTN) in the range from 0.265 to 15.4 GHz and the data from six patrol radiotelescopes from the Berna University, one of them working as an interferometer in the frequency interval 8.4 GHz and 89.4 GHz.The particularity of the radio spectrum of this event consists in the existence of a plane region of about one decade extension which was tried to be explained through a free-free absorption of the medium. From the radio spectrum we derive the parameters that characterize the electrons which produce the emission and the source of emission.The images from the H alpha solar telescope for Argentina (HASTA) were used to identify the possible emission sources and to obtain the light curves that were compared with the radio emission evolution