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Interaction of Oscillations with Near Surface Convection
Jesper Schou (Max Planck Institute for Solar System Research), Bj÷rn L÷ptien (MPS)
In helio- and asteroseismology there are several large but unexplained signals. Examples include the so called surface effect which offsets the observed mode frequencies relative to those expected and an apparent phase shift of solar oscillations depending on the center to limb distance. These two effects are most likely both caused by the interaction of the oscillations with the near surface convection. Here we will investigate this problem by examining how the observed oscillations depend on where in the granulation they are observed and analyze simulations to see if they agree with the observations and can shed light on the details of the interaction mechanism.