An oval band situated between magnetic latitudes of 64 and 70° where the visible aurora occurs overhead. During disturbed geomagnetic conditions, the auroral oval generally expands equatorward. Areas within the auroral ovals are called the polar cap.
In solar-terrestrial terms, an oval band around each geomagnetic pole which is the locus of structured aurorae
From space, the auroral zone looks like a donut of light hovering over the north and south poles. This auroral oval can easily be seen in satellite images, and its brightness and size changes with the level of solar activity. (TOP OF THE PAGE) (CLOSE WINDOW)
the region in which aurora appears at the same time, corresponding to the "ring of fire" around the magnetic pole, often observed by satellite cameras. It resembles a circle centered a few hundred kilometers nightward of the magnetic pole, and its size varies with magnetic activity. During large magnetic storms it expands greatly, making auroras visible at regions far from the pole, where they are a rare occurence.
the oval, centered on a magnetic pole, where auroral activity takes place. At any time, the limits of the ring depend on conditions such as the number and energy of electrons in the aurora.
An oval-shaped distribution of the aurora. The oval is asymmetrical, but generally around the region of the Arctic and Antarctic. The oval increases in intensity and size when auroral activity is more intense.
The pattern of auroral light around the north and south magnetic poles. The auroral oval expands and contracts over a period of hours and days, depending on geomagnetic activity.
the region in which aurora can be seen at any single time, as observed (for instance) by satellite cameras. It resembles a circle centered a few hundred kilometers nightward of the magnetic pole, and its size varies with magnetic activity. During large magnetic storms it expands greatly, making auroras visible at regions far from the pole, where they are rarely seen.
