By George Barricman | 2025-08-20
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Solar Activity
On 08/24/2025 09:55 am by Jim Militello | Tucson, Arizona USA
Hydrogen alpha image of the Sun showing active region 4191 with a huge sunspot.
Coronado SolarMax 90 Ha solar telescope, ZWO ASI183mm video camera.
The image is a stack of 20 video frames processed with Autostakkeert, Registax, Photoshop.
