Acoustic-gravity waves in a quiet region of the solar atmosphere

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Abstract
We study numerically the propagation of small-amplitude acoustic-gravity waves in a quiet region of the gravitationally stratified solar atmosphere. These waves are excited by a localized in-space periodic driver which acts in the vertical component of velocity at the bottom of the photosphere. Our aim is to study these waves and their period variations in space in 2D medium approximation. We collect the wave signals along few spatial directions to mimic line-of-sight (LOS) effects. The results of numerical simulations we performed reveal that the detected wave periods depend strongly on the LOS directions; above the driver, along the vertical direction, only acoustic waves with their periods smaller than about 300 s are free to propagate, while obliquely to the gravity action longer-period gravity waves can penetrate a quiet region of the solar atmosphere.
Funding Information
  • Narodowe Centrum Nauki (2014/15/B/ST9/00106)

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