Thursday, June 19, 2025

Summar solstice

 Dark shadows that may appear this time of year in some GONG H-alpha images (first photo) may be tree branches, not clouds. As we approach summer solstice and the sunset reaches its most northerly position, this part of the horizon may be obstructed by trees as in the second image taken by Tim Purdy at GONG site at Big Bear Solar Observatory, California.


 

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