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RATAN-600 OBSERVATIONS OF MICROWAVE STRUCTURE OF THE QUIET SUN
T.I. Kaltman, V.M. Bogo d, A.N. Korzhavin, S.Kh. Tokhchukova Sp ecial astrophysical observatory of RAS, Saint-Petersburg, Russia arles@mail.ru To investigate microwave emission of the quiet Sun the observations with RATAN-600 from Septemb er, 2005 to March, 2006 in the range 6-16.4 GHz with the 1% frequency resolution were used. We present an analysis of observational data for several days with different p ositional angles. A small-scaled structure with the size of 20-40 arc sec is regularly observed with RATAN-600 one-dimensional observations. A high degree of correlation for separate elements of the structure in the different frequencies channels at all band of the observations exists. Our estimates of an average life time are several hours. There is a direct dep endence b etween the sizes and life of time for separate elements. The sp ectra of brightness temp eratures grow with wavelength. The emission p olarization is very likely negligible. The characteristics of presented observed structure are very close to ones of a sup er granulation (chromosphere network) which is not sufficiently investigated in microwaves. The separated bright sources are identified with bright X-ray p oints or bip olar magnetic structure. Our mo deling demonstrates that the structure of the chromosphere network can exist in a wide spatial range, but really only the sources with the sizes of 20-40 sec of arc can b e detected at microwaves. Possible mechanisms of such radio emission are discussed. The daily monitoring with RATAN-600 observations provides p ossibilities to regularly estimate a state of the quiet Sun by emission characteristics of microwave small-scaled structure and to trace rises of new centers of activities. This work was supp orted by the RFBR grants 05-02-16228 and 06-02-17034a.