Small-scale Bright Point Characteristics at High-resolution with the Daniel K. Inouye Solar Telescope

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Abstract
Bright points (BPs) are small-scale, dynamic features that are ubiquitous across the solar disc and are often associated with the underlying magnetic field. Using broadband photospheric images obtained with the Visible Broadband Imager at the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST), the properties of BPs have been analyzed with DKIST for the first time at the highest spatial resolutions achievable. BPs were observed to have an average lifetime of 95 ± 29 s and a mean transverse velocity of 1.60 ± 0.41 km s −1 . The BPs had a log-normal area distribution with a peak at 2300 km 2 . Transverse velocities and lifetimes across the DKIST images were comparable and consistent with previous studies. The area distribution of the DKIST data peaked in areas significantly lower than those from the literature. This was explored further and was observed to be due to an overestimation of BP areas due to the merging of close features when the spatial resolution is reduced, in tandem with possible oversplitting of features in the DKIST images. Furthermore, the effect of variable seeing in the data was determined. This showed that the average spatial resolution of the data was around 0 . ″ 034 ± 0 . ″ 007 , in comparison to the theoretical diffraction limit of 0 . ″ 022 . Accounting for the influence of seeing, the peak of the area distribution of BPs in the DKIST data was estimated as 4800 km 2 , which is still significantly lower than previously observed.
Funding Information
  • UKRI ∣ Science and Technology Facilities Council (ST/P000304/1)
  • UKRI ∣ Science and Technology Facilities Council (ST/T00021X/1)
  • UKRI ∣ Science and Technology Facilities Council (ST/X000923/1)
  • UKRI ∣ Science and Technology Facilities Council (ST/M000826/1)
  • Nemzeti Kutatási Fejlesztési és Innovációs Hivatal (K142987)
  • Nemzeti Kutatási Fejlesztési és Innovációs Hivatal (TKP2021-NKTA-64)
  • Leverhulme Trust (LINAS)
  • National Aeronautics and Space Administration (19-HSODS-004)
  • National Aeronautics and Space Administration (21-SMDSS21-0047)
  • International Space Science Institute (Team 502)
  • Norges Forskningsråd (262622)
  • Royal Society (Hooke18b/SCTM)
  • Bureau of International Cooperation, Chinese Academy of Sciences (2024PVA0043)

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