Observations of short period oscillations in two dimensions

Observations of the photospheric velocity field at the disk center with a cadence of five frames per second strongly support the idea that short period oscillations arise from a combination of image motion and horizontal gradients of the line of sight velocity field. Any genuine solar short period oscillations are effectively masked by these false short period oscillations.Operated by the Association of Universities for Research in Astronomy Inc., under contract with the National Science Foundation.Visiting Astronomer, Solar Division, KPNO.