According to Dr. Schmoll, the Earth's magnetic field has a north and south pole, just like any magnet. The sun does as well. Dr. Schmoll says that science is still figuring out the specifics, but in short, the poles of the sun and Earth line up better during the equinox, which is conducive to more frequent auroras.

Tonight could bring a rare treat to skywatchers across the United States: a vivid display of the northern lights visible far beyond their usual polar boundary. Thanks to a particularly strong geomagnetic storm,