Possible Signature of Sausage Waves in Photospheric Bright Points

Sausage waves have been frequently reported in solar magnetic structures such as sunspots, pores, and coronal loops. However, they not unambiguously identified photospheric bright points (BPs). Using high-resolution TiO image sequences obtained with the Goode Solar Telescope at Big Bear Observatory, we analyzed four isolated BPs. It was found that their area average intensity oscillate for several cycles an in-phase fashion. The oscillation periods range from 100 to 200 seconds. We interpreted phase relation a signature of sausage waves, particularly slow after discussing sausage-wave theory opacity effect.