The Enhanced Coronal Green Line Intensity and the Magnetic Field Gradients

Abstract

Extended abstractRamesh, Nagabhushana and Varghese (1999) have shown that the green line intensity enhancement does not depend entirely on the strength of the underlying spot magnetic field though the coronal intensity enhanced feature is almost sure to occur at the locations of sunspots with strong magnetic fields and at the locations of plages having larger areas. Presented here are the results of an analysis of intensity of green line emission and the active region magnetic signatures as seen in Stanford magnetograms.The data base used in this study consisted of homogeneous data set (HDS) of 5303 Å green coronal intensity measured at position angle intervals of 5° on any given day from several stations (see Rybanský, 1975) and brought down to the common scale of Lomnicky Štit. Daily maps of sunspots, and Ca plages are then superposed on the green line intensity maps of the corresponding day. Resultant composite maps are then compared with the Stanford magnetograms published inSolar Geophysical Data.