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.
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Data Availability
The datasets generated during and/or analyzed during the current study are available on the web site of BBSO, www.bbso.njit.edu/~vayur/NST_catalog/.
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Acknowledgments
We would like to thank Richard Morton, Mingde Ding, and Tom Van Doorsselaere for helpful comments and suggestions. This work has been supported by the Strategic Priority Research Program of CAS (grant XDA17040507) and NSFC grants 11825301 and 11790304. B. Li was supported by the NSFC grants 11761141002 and 41974200. The BBSO operation is supported by NJIT and US NSF AGS-1821294 grant. The GST operation is partly supported by the Korea Astronomy and Space Science Institute, the Seoul National University, and the Key Laboratory of Solar Activities of Chinese Academy of Sciences (CAS) and the Operation, Maintenance and Upgrading Fund of CAS for Astronomical Telescopes and Facility Instruments.
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Magnetohydrodynamic (MHD) Waves and Oscillations in the Sun’s Corona and MHD Coronal Seismology
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Gao, Y., Li, F., Li, B. et al. Possible Signature of Sausage Waves in Photospheric Bright Points. Sol Phys 296, 184 (2021). https://doi.org/10.1007/s11207-021-01928-9
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DOI: https://doi.org/10.1007/s11207-021-01928-9