Auroras: Paintings in the Sky

What are auroras? What do they look like?What makes them happen? Where can you see them? An illustrated journey that attempts to answer these questions and more: "Far north in the night sky, a faint glow appears on the horizon. Green and red flames of light stretch across the sky. A glowing curtain of light forms, waving and swirling above you. As the lights fade away the dark night closes over you once again. A collection of aurora links, including sites on auroras, the Sun and the Earth's magnetosphere."