H-alpha

H-alpha is a specific wavelength of light emitted by hydrogen atoms when their electrons drop from a higher energy level to the second-lowest one. It appears as a bright red color in astronomical observations, especially in images of the Sun's solar atmosphere and other space objects. H-alpha light is useful for studying solar activity, such as sunspots and solar flares, because it reveals details about the hot, glowing hydrogen gas. By capturing H-alpha images, scientists can better understand the Sun's behavior and the dynamics of its outer layers.