<human>:  Tell me about the Northern Lights, including causes, viewing time periods, and geographical locations to watch them from.
<bot>: The Northern Lights, also known as Aurora Borealis, are a beautiful natural phenomenon. They occur when charged particles from the sun interact with the Earth’s atmosphere and create vibrant displays of light that can range from a pale green to a deep purple. Usually occurring at high latitudes in the Northern Hemisphere, people can spot these displays from countries like Norway, Finland, Sweden, Canada and Iceland. The best time of year to see them is from the months of September through March because the nights are longer and darker. The cause of the Northern Lights is that solar particles collide with molecules of atoms in the Earth’s atmosphere. This collision then causes ionization to take place, releasing energy that stimulates the atmosphere and produces the beautiful light shows.