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Using the local helioseismic technique of ring diagram we analyze thefrequencies of high--degree f- and p-modes derived from both velocity andcontinuum intensity data observed by MDI. Fitting the spectra with asymmetricpeak profiles, we find that the asymmetry associated with velocity lineprofiles is negative for all frequency ranges agreeing with previousobservations while the asymmetry of the intensity profiles shows a complex andfrequency dependent behavior. We also observe systematic frequency differencesbetween intensity and velocity spectra at the high end of the frequency range,mostly above 4 mHz. We infer that this difference arises from the fitting ofthe intensity rather than the velocity spectra. We also show that the frequencydifferences between intensity and velocity do not vary significantly from thedisk center to the limb when the spectra are fitted with the asymmetric profileand conclude that only a part of the background is correlated with theintensity oscillations.

Comparison of High-degree Solar Acoustic Frequencies and Asymmetry between Velocity and Intensity Data