This page hosts images of the Sun that are observed frequently (2-3 times per week) depending on the Sun's activity and the weather conditions. The images are created using the video frames stacking technique. For the video capturing, a mirrorless crop camera and an apochromatic telephoto lens are used. The videos are recorded in UHD (3840x2160 pixels) analysis with a 24 fps frame rate and with the lens set at 500mm focal length and an aperture of f/10. At the end of July 2021, an 1.4x teleconverter lens has been also installed. The current pixel scale of the set-up is ~1.1 ''/pixel. A solar filter is set in front of the lens to reduce the sunlight intensity. Each image contains three planets and the Moon in scale-size for direct comparison with the spots sizes.
From early 2021, the Sun has entered the 25th (observed) cycle (~11.5 yr period) and the predicted maximum of solar activity is anticipated between 2025-2026. The number of spots per month can be found here.
Archive of images (2023)
Archive of Images (2022)
Archive of Images (2021)
Old Archive of images
The following images were taken between 2005-2006 and in 2011 using a webcam and a 20-cm telescope. The video frames stacking technique was used.
