Reflection and refraction of (magneto-)acoustic waves at the magnetic canopy: further evidences from multi-height seismic data

TL;DR

This study provides additional evidence that seismic halos around magnetic structures are caused by the reflection and refraction of magnetoacoustic waves, using multi-height solar data to analyze phase shifts and oscillation power.

Contribution

It demonstrates how phase-shift maps from multi-height data reveal direct signatures of wave reflection and refraction in the solar atmosphere, advancing understanding of wave behavior near magnetic canopies.

Findings

Phase-shift maps indicate wave reflection and refraction.

Correlation between phase shifts and oscillation power.

Further evidence linking seismic halos to wave mode conversions.

Abstract

We recently presented evidences (Rajaguru et al. 2012) 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 \AA channels) onboard Solar Dynamics Observatory (SDO). Using the same data, we here present and discuss further evidences 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.