What causes aurora borealis?
The aurora borealis is caused when the sun emits ions that move from the sun in ionized gas. When the ionized gas comes in contact with the magnetic field, some of the ions get trapped and interact with the Earth’s atmosphere. This makes the ions glow and that what you see when you observe the aurora borealis. You can find more information here: http://www.crh.noaa.gov/fsd/astro/aurora…
