Effects of granulation on the visibility of solar oscillations
Max-Planck-Institut für Sonnensystemforschung,
Received: 30 April 2015
Accepted: 27 July 2015
Context. The interaction of solar oscillations with near surface convection is poorly understood. These interactions are likely the cause of several problems in helio- and astero-seismology, including the so-called surface effect and apparently unphysical travel time shifts as a function of center to limb distance. There is thus a clear need for further theoretical understanding and observational tests.
Aims. The aim is to determine how the observed modes are affected by the convection.
Methods. I used HMI velocity and intensity images to construct k-ω diagrams showing how the oscillation amplitude and phase depend on the local granulation intensity.
Results. There is a clear and significant dependence of the observed properties of the oscillations on the local convection state.
Key words: Sun: granulation / Sun: oscillations
© ESO, 2015