T.I. Kaltman, S. Kh. Tokhchukova, V.M. Bogod, A.N. Korzhavin
St.-Petersburg Branch of the Special Astrophysical Observatory,
Russian Academy of Sciences, St.-Petersburg 196140, Russia
To investigate microwave emission of the quiet Sun the observations with RATAN-600 in range 6-16.4 GHz with 1resolution were used. We present an analysis of observational data for several days from September, 2005 to March, 2007 with different positional angles. A small-scaled structure with the sizes of 20-40 arc sec is regularly observed with one-dimensional observations of RATAN-600. The high degree of correlation of separate elements of the structure on the different frequencies channels at all band of the observations is existed. Our estimates of an average life time are several hours. There is the direct dependence between the sizes and life of time for the separate elements. The spectra of brightness temperatures are growing with wavelength. The characteristics of presented observed structure are very close to ones of super granulation (chromosphere network). which is difficult to study at microwaves. The separated bright sources are identified with X-ray bright points, bipolar magnetic structure and different small scaled features observed in optical and EUV range. Possible mechanisms of such radio emission are discussed. It is supposed, that observed peaks of radio emission associated with a number of small scaled loop-like structures of different heights. The model estimations for free-free and gyroresonance emission are done. The daily monitoring with RATAN-600 observations allow to do the regular estimates of the state of quiet Sun by measuring of the characteristics of microwave emission and by tracking of the rises of new centers of activities.