Issue |
A&A
Volume 580, August 2015
|
|
---|---|---|
Article Number | L11 | |
Number of page(s) | 4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201526445 | |
Published online | 13 August 2015 |
Effects of granulation on the visibility of solar oscillations
Max-Planck-Institut für Sonnensystemforschung,
Justus-von-Liebig-Weg 3,
37077
Göttingen,
Germany
e-mail:
schou@mps.mpg.de
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
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