Possible Signature of Sausage Waves in Photospheric Bright Points

TL;DR

This paper presents evidence of sausage wave signatures in photospheric bright points, identified through high-resolution imaging, showing oscillations in area and intensity consistent with slow sausage waves.

Contribution

It provides the first potential observational signature of sausage waves in photospheric bright points, expanding understanding of wave phenomena in solar magnetic structures.

Findings

Oscillations in area and intensity are in phase.

Oscillation periods range from 100 to 200 seconds.

Signature consistent with slow sausage waves.

Abstract

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