  The acoustic spectra in sunspots are known to be richer in higher frequency
power. We have attempted a generalized study of the effect of magnetic fields
on the shape of the acoustic spectrum using GONG+ bread-board data (spatial
scale of ~ 2 arc-sec per pixel) of 11 May, 2000 and 12 June, 2000. The mean
power spectra of the velocity oscillations were obtained by averaging over
several spectra for different values of the magnetic field. With increasing
magnetic field, the acoustic power increases at higher frequencies and
decreases at lower frequencies with a transition at ~= 5 mHz. This behaviour is
slightly different from earlier results obtained from SOHO/MDI data.
