Did you know that aurora is not just green, red and blue? It can also be white!
Have the white auroral “GHOSTs” always been there – and why haven’t we seen them before? Traces exist in older data, but past instruments and methods overlooked them. Traditional auroral studies focused on narrow wavelengths, while GHOSTs appear as a broadband glow that can look white, gray, or faintly colored. Only now, with the right combination of instruments, can we confirm them as true GHOST aurora.