Experiments on high-spatial-resolution observations of the Sun at the A.B. Severny Solar Tower Telescope of the Crimean Astrophysical Observatory

Abstract

In this paper, we describe high-cadence and high-spatial-resolution observations of the Sun acquired by the A.B. Severny Solar Tower Telescope (STT-1) in October and November, 2021. The spatial resolution of ground-based optical telescopes is usually limited by seeing. However, the spatial resolution can be improved significantly by a postprocessing of hundreds of short-exposure images of the object. In order to get the data required for the post-processing, the telescope was equipped with a camera and a high-speed detector. The detector was able to take up to tens of frames per second, which is necessary for speckle-reconstruction of the solar surface images. A thorough visual analysis of the reconstructed images as well as their comparison with the data provided by SDO/HMI yielded very promising results. Individual granules as well as penumbral fibrils are clearly seen in the images. High-spatial-resolution observations by STT-1 provide new opportunities for the studies of the Sun.