Observed Local Dispersion Relations for Magnetoacoustic-gravity Waves in the Sun’s Atmosphere: Mapping the Acoustic Cutoff Frequency

We present the observed local dispersion relations for magnetoacoustic-gravity waves in the Sun's atmosphere for different levels of magnetic field strength. We model these data with a theoretical local dispersion relation to produce spatial maps of the acoustic cutoff frequency in the Sun's photosphere. These maps have implications for the mechanical heating of the Sun's upper atmosphere, by magnetoacoustic-gravity waves, at different phases of the solar magnetic activity cycle.