Observed local dispersion relations for magneto-acoustic-gravity waves in the Sun's atmosphere: Mapping the acoustic cut-off frequency

Stuart M. Jefferies, Bernhard Fleck, Neil Murphy, Francesco Berrilli

Published 2019-10-08Version 1

We present the observed local dispersion relations for magneto-acoustic-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 cut-off frequency in the Sun's photosphere. These maps have implications for the mechanical heating of the Sun's upper atmosphere, by magneto-acoustic-gravity waves, at different phases of the solar magnetic activity cycle.