The large and small scale density structure in the solar corona

In this thesis we have investigated the three-dimensional distribution of the polarization brightness product (pB) and then inferred electron density distribution with respect to the heliographic current sheet during the declining phase of the solar cycle 20. This is the first electron density model of the large-scale corona based on its association with the magnetic current sheet.;Synoptic pB data from the K coronameter and the White Light Coronagraph aboard Skylab were used to locate the current sheet, taken as the center of the 'band of coronal streamers'. Analyses of pB scans as a function of minimum distance from the current sheet ;Following conclusions were drawn on the density distribution: (1) unlike the Munro and Jackson model (1977) we conclude that for a given solar distance r, the electron density inside the polar coronal hole remains constant with respect to the magnitude latitude ;We used the XUV data and the white-light eclipse data of March 17...