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Paper: Reflection and Refraction of (Magneto-)Acoustic Waves at the Magnetic Canopy: Further Evidences from Multi-Height Seismic Data
Volume: 478, Fifty Years of Seismology of the Sun and Stars
Page: 345
Authors: Rajaguru, S. P.; Sun, X.; Hayashi, K.; Couvidat, S.
Abstract: We recently presented evidence (Rajaguru et al. 2013) that seismic halos around expanding magnetic structures in the lower solar atmosphere are related to the acoustic to magnetoacoustic wave conversions, using multi-height data from Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA: 1700 and 1600 Å channels) onboard Solar Dynamics Observatory (SDO). Using the same data, we present and discuss here further evidence through analyses of maps of phase-shifts between observables from different heights and their correspondence with oscillation power. The phase shift maps provide more direct signatures of reflection and refraction of (magneto-)acoustic wave modes.
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