Evidence of slow magneto-acoustic waves in photospheric observations of a sunspot

Details Evidence of slow magneto-acoustic waves in photospheric observations of a sunspot Evidence of slow magneto-acoustic waves in photospheric observations of a sunspot

2009-09-29

arxiv.org/abs/0909.5332v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 5 figures, submitted to Astrophysical Journal Letters

Scientific paper

We show the observational evidence for the presence of MHD waves in the solar photosphere deduced from SOHO MDI Dopplergram velocity observations. The magneto-acoustic oscillations are observed as acoustic power enhancement in the sunspot umbra at high frequency bands in the velocity component transverse to the magnetic field. We use numerical modelling of the wave propagation through localised non-uniform magnetic field concentration along with the same filtering procedure as applied to the observations to identify the observed waves. Underpinned by the results of the numerical simulations we classify the observed oscillations as slow magneto-acoustic waves excited by the trapped sub-photospheric acoustic waves. We consider the potential application of the presented method as a diagnostic tool for magnetohelioseismology.

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