A solar eclipse occurs when the moon casts its shadow upon the earth. During totality the sun’s corona becomes visible as a white halo around the black disk of the moon. The human eye observes delicate coronal features and enormous variations in brightness which a single photograph cannot possibly capture. Pink prominences are visible; these looping arcs of plasma erupt along magnetic field lines which arch far above the surface of the sun.

Wyoming Corona, 2017 solar eclipse

Wyoming Corona
Total solar eclipse of August 21, 2017 from Evansville, Wyoming
Nikon D500, vintage 300mm Nikkor lens, f/5.6, ISO 100
9 exposures from 1/1600 to 1/6 sec, stacked using Pellett’s method to approximate the naked eye view