The aurora oval

The aurora oval

Fig. 3.23 . The POLAR spacecraft looks down on an aurora from high above the Earth's north polar region in February 2000, showing the northern lights in their entirety. The glowing oval is 4.5 thousand kilometers across. The most intense aurora activity appears in bright red or yellow. (Courtesy of NASA/U. Iowa.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University