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auroral oval. auroral oval. An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
What We See. Auroras form in rings centered over the Earth's magnetic poles. During an aurora, rings form around the North and South poles at the same time. Even near the poles, someone on Earth can only see a tiny section of the auroral oval. Look at the satellite image of the aurora borealis to the left.