An overhead aurora of green tinged with purple shines above the Huna Tribal House at Bartlett Cove. This view is looking almost straight up, but also a little to the south. An aurora needs to be very strong at the latitude of Glacier Bay in order to be able to see the lights at that angle. The aurora forms when charged particles from the Sun are carried by the solar wind toward Earth and guided by the planet’s magnetic field to the polar regions. There, the particles collide with oxygen and nitrogen high in the atmosphere, exciting these gases and causing them to emit light as they return to normal energy levels. Different gases and altitudes create different colors, with green from oxygen being the most common, while red, blue, and purple appear less often. Photographer: Sean Neilson