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This observation was using a white light filter where over 99.999% of the Sun’s light is blocked out, making it possible for me to view the photosphere. This is called white light. You can see NOAA 10969 in the cooler layer. The chromosphere becomes invisible to me again. The two dark sections of umbrae within the penumbra of this action region were very prominent. I could see a darkened outline of the penumbra and it had an almost rectangular shape with curved corners. Of particular interest was the very faint darkened area to the right of the sunspot. This happens to me fairly often, seeing little bonus features like this. I’m still not sure what causes it. Normally I would think it was contrast from faculae that I was unable to discern. Normally we can only see faculae closer to the darker limb regions. But often I can see an outline of contrast suggesting faculae present when the active region is toward the center of the disk.
This time it is a little different. If I didn’t know any better, it looked like a thick triangular cooler region next to the sunspot. By this I mean cooler than the photosphere, hotter than the umbra, and only just slightly hotter than the penumbrae. |
