Influence of the Conversion Layer on the Dispersion Relation of Waves in the Solar Atmosphere |
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| Authors: | M Haberreiter W Finsterle |
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| Institution: | 1. Laboratory for Atmospheric and Space Physics, University of Colorado, 1234 Innovation Drive, Boulder, CO, 80303, USA
2. Physikalisch-Meteorologisches Observatorium Davos, Dorfstrasse 33, 7260, Davos Dorf, Switzerland
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| Abstract: | Observations carried out with the Magneto-Optical Filter at Two Heights (MOTH) experiment show upward-traveling wave packets in magnetic regions with frequencies below the acoustic cut-off. We demonstrate that the frequency dependence of the observed travel times, i.e. the dispersion relation, shows significant differences in magnetic and non-magnetic regions. More importantly, at and above the layer where the Alfvén speed equals the sound speed we do not see the dispersion relation of the slow acoustic mode with a lowered cut-off frequency. Our comparisons with theoretical dispersion relations suggest that this is not the slow acoustic wave type for the upward low-frequency wave. From this we speculate that partial mode conversion from the fast acoustic to the fast magnetic wave might take place. |
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