Probabilistic characteristics of main components of the quiet Solar corona, and calculation of equatorial brightness distribution in the wavelength range of 1-100 cm

We propose a model of the atmosphere of quiet solar regions, corresponding to the radiation at wavelengths from 1 cm to 1 m. A technique for calculating brightness of the multi-component atmosphere is given. The model is represented by a set of loops and spicules arranged by size, and by free (interloop) matter. There are 10 loops with radii from 3100 km to 210 000 km; spicules are arranged in height from 400 km to 11 000 km. We used the well-known models of quiet regions of the centre of the Sun’s disc to get initial dependences of temperature and atmospheric electron density on height. Applying the approximation method, we determined parameters of free matter from these dependences. The brightness calculation comprised an uncomplicated summation of brightness in separate layers of atmospheric components, taking account of their probabilities and overall transmission coefficient. Probabilistic characteristics of atmospheric components were determined using iterative methods and comparison results between the calculated equatorial brightness distribution and experimental data. First a good agreement was obtained between the theoretical brightness distribution and observational data over a wide wavelength range.