A Search for Torsional Oscillations in the Fe XIV Solar Corona

Previous studies of the rotation of the solar corona have found evidence for variations with time in the differential rotation rate similar to what has been referred to as torsional oscillations in the photosphere and the convection zone. However, the consistent data set of Fe XIV intensities obtained at Sacramento Peak since 1973 has not been exhaustively studied to determine if such oscillations exist. This data set has the advantage that a single photoelectric technique has been used to obtain the data over its entire length, whereas other studies have used data sets compiled from data obtained in a variety of methods from several observatories. The use of the Sacramento Peak database also has the advantage that the data have been corrected for sky-background variations in real time and thus are very precise over the time required to take a single scan. The results of this analysis will be presented and compared with those using other data sets.