Asymmetry of contours of the coronal line Fex 6374 A

According to the mass qualitative analysis of contour forms of λ 6374 Å emission coronal line, 80 % of these forms are asymmetric. Contours with more intense blue wing make up 52 %, whereas those with red wing account for only 28 %. In search of nature of contour wing intensification, histograms of ray velocity distributions in each latitude range of 10 degrees have been considered using the same material (~5500 contours reduced to the NE-quadrant). These distributions also demonstrated blue asymmetry apparently caused by lack of movements on the Sun's surface compared to rotation; this agrees with papers of Labonte and Howard, and Makarov and Tlatov. Nature of blue wings of the line FeX λ 6374 Å can not be explained in a similar way.