Alessandro Carrozzi
Several sunspot groups — active regions AR 4136, 4139, 4143, and 4146 — all approach the solar limb in this Hydrogen-alpha image taken July 19, 2025 with a 6-inch f/25 refractor.
The spotted Sun
Alessandro Carrozzi
Several sunspot groups — active regions AR 4136, 4139, 4143, and 4146 — all approach the solar limb in this Hydrogen-alpha image taken July 19, 2025 with a 6-inch f/25 refractor.