On the detection of internal gravity waves in the solar photosphere

Abstract

Abstract The distribution of temperature perturbations over the solar photosphere was reconstructed. The k - ω and phase filtering was applied to Fourier image of space–time variations of temperature in order to find the signatures of local internal gravity waves. Within the convectively stable photospheric layers, the structures have been identified featuring the following properties: quasi-periodicity in space (at scales of mesogranulation) and time, mostly horizontal propagation with subsonic velocities, the group velocity of and the wavepacket perpendicular to its phase velocity. Such properties are exactly those of internal gravity waves.