Auroras are also known as the Northern Lights. An aurora is caused by the interaction of Earth’s magnetic field with charged particles that stream away from the sun. Predictions of auroras can only be made a few days in advance of the events, so you may see one before you hear that it was going to happen.
Auroral displays often begin as a faint glow at the northern horizon when the sky has completely darkened. Through the night the glow gradually rises higher. The bottom edge of the glow becomes distinct while the top remains fuzzy. With binoculars you can see stars through the glow. Parts of the glow may brighten and drift forming rays that shoot upward, or waving curtains. The brightest parts of the glow may seem green, blue, red or purple in color. The display usually lasts a few hours before fading from view.