A flash spectrum refers to the spectrum of the solar chromosphere that becomes briefly visible during a total solar eclipse. As the Moon covers the Sun’s photosphere, the bright solar disk is concealed, and the outer layers, like the chromosphere, become visible. The flash spectrum arises during the brief moments of totality when the Moon fully covers the solar disk. It reveals spectral lines corresponding to the solar atmosphere’s outer layers, providing insights into the composition and temperature of elements present. Analyzing the flash spectrum has been instrumental in advancing our understanding of the Sun’s outer atmosphere and the intricacies of solar physics.
