Umbral Dots Observed in Photometric Images taken with 1.6 m Solar Telescope

TL;DR

This study used high-resolution photometric imaging with a 1.6 m solar telescope to analyze the properties of 418 umbral dots, revealing their size, intensity, and shape characteristics at near-diffraction-limited resolution.

Contribution

The paper provides detailed measurements of umbral dot sizes, intensities, and shapes using high-resolution imaging, with no substructures observed despite high resolution.

Findings

Median diameter of UDs is 0.5''

Median intensity difference is 37%

Uds appear circular

Abstract

Umbral dots (UDs) were observed using the 1.6 meter solar telescope. Achieved conventional diffraction limit in the TiO 705.68 nm spectral line used was 0.1". The 418 UDs were analysed. Median diameter was 0.5'' and median intensity difference between darkest part of the UD's background and brightest part of the UDs was 37%. Despite to achieved resolution, no UDs substructures were visible. The analysed UDs appeared to be circular.