Stochastic Seismic Emission from Acoustic Glories in Solar Active Regions

Helioseismic images of active regions show enhanced seismic emission in 5 mHz oscillations in a halo surrounding the active region called the "acoustic glory". In this paper we analyse the high-frequency power excess surrounding two active regions that occurred during the "shy" ascending phase of the solar cycle 24, at the beginning of 2010. This study compares the acoustic properties of seismic emission from acoustic glories with that from the quiet Sun. The power distribution of quiet-Sun seismic emission far from solar activity is exponential, as for random Gaussian noise, and therefore not episodic. The magnitudes of the acoustic glories and their seismic structure allow us to make predictions of the seismic behaviour of active regions and compare the data with present theoretical models.