By Hassan Dadashi Arani | 2025-07-17
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Solar Activity
On 07/17/2025 11:30 am by Jim Militello | Tucson, Arizona USA
Hydrogen alpha image of the Sun showing numerous active regions with sunspots.
Coronado SolarMax 90 Ha solar telescope, ZWO ASI183mm video camera.
The image is a stack of 20 video frames processed with Autostakkert, Registax, Photoshop.
