ИСТИНА

From May through June this year a multi-spectral observing campaign of quiescent prominence took place. Observations were carried out in EUV by AIA/SDO, in soft X-rays by XRT on Hinode and in H-alpha by horizontal spectrographs of the Ondrejov observatory. Our aim is to make a statistics of the total masses of quiescent solar prominences. For calculations of the column mass values in a given prominence position we use an improved method of Heinzel et al. (2008). We take into account the possibility of non-symmetrical distributions of the coronal X-ray and EUV emissivity in front and behind the prominence. H-alpha intensities are used for estimations of the hydrogen ionization degree, a very important parameter for correct column-mass estimates. Then integrating the column mass over the whole area of a prominence, the total mass is obtained. We present results for one selected prominence observed during the campaign. We have been also testing the quality of data and reliability of the method. After this we will be able to estimate the total mass of all other observed prominences and make an extended statistics.