Saturday, 4 January 2020

AR12755 4th January

AR12755 from cycle 25 is still visible as an active region with sunspot but activity is declining, as the main spot can seen to be divided by a light bridge, which is a usual indicator of decay.  This image is from the Solar Dynamics Observatory, but for amateurs it is still visible as a bright area in Hydrogen Alpha, and the plage will remain visible in CaK light for many days to come.