Contains:  Solar system body or event
Sunspots (20230718) - chaotic to calm AR13372, firstLight

Sunspots (20230718) - chaotic to calm AR13372

Sunspots (20230718) - chaotic to calm AR13372, firstLight

Sunspots (20230718) - chaotic to calm AR13372

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Sunspots (20230718) - chaotic to calm AR13372

Striking changes, both large and small, can currently be observed in the spectrum of visible light on the solar disc - daily and even hourly entire sunspots or their umbrae, penumbrae and light bridges and other properties arise and disappear.

Perhaps most interesting today is AR13373, an active region just a few degrees north of the solar equator. According to the official census, it contains no fewer than 20 sunspots and plenty of chaotic umbrae overall.

It is striking that the big active reagion AR13372 - upper right of AR13373 - simultaneously contains a "Sea of Calm" on the right and a chaotic appearing "atoll of innumerable islets"  to the left. I suspect that this could be related to the position and distribution of the magnetic poles - but I don't have the expertise to judge that. Viewing the current SDI HMI magnetogram suggests this idea to me.

Expert comments very welcome!

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Sunspots (20230718) - chaotic to calm AR13372, firstLight