Influence of the Conversion Layer on the Dispersion Relation of Waves in the Solar Atmosphere

Details Influence of the Conversion Layer on the Dispersion Relation of Waves in the Solar Atmosphere Influence of the Conversion Layer on the Dispersion Relation of Waves in the Solar Atmosphere

2009-01-23

arxiv.org/abs/0901.3614v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted for publication in Solar Physics

Scientific paper

10.1007/s11207-010-9523-6

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 Alfven 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 do not suggest this is 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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