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Ja n 20 09 INFLUENCE OF THE MAGNETIC CANOPY ON THE DISPERSION RELATION OF WAVES IN THE SOLAR

Abstract. Observations carried out with the Magneto-Optical Filter at Two Heights (MOTH) experiment show upward traveling waves in magnetic regions with frequencies below the acoustic cut-off. We demonstrate that the dispersion relation of the observed waves show significant differences in magnetic and non-magnetic regions. More importantly, in the low β-regime we do not see the dispersion relation of the field guided slow acoustic mode with a lowered cut-off frequency. Our comparisons with theoretical dispersion relations do not indicate one single wave type for the upward low-frequency wave. From this we conclude that partial mode conversion and transmission takes place.