auroral oval

These narrow circular regions correspond to Jupiter's main auroral ovals.

During magnetically quiet periods, the electrojet is generally confined to the auroral oval.

In the early1970's, Triad data demonstrated that permanent electric currents flowed between the auroral oval and the magnetosphere.

The energetic particles coming from Jupiter's magnetosphere create bright auroral ovals, which encircle the poles.

Auroras are occasionally seen in temperate latitudes, when a magnetic storm temporarily enlarges the auroral oval.

Callisto may have a spot as well; however, it would be unobservable because it would coincide with the main auroral oval.

Satellite images of the aurora from above show a "ring of fire" along the auroral oval (see above), often widest at midnight.

This is because they are best viewed from beneath the "auroral ovals" - ring-shaped areas that encircle the Earth's magnetic poles at 60 to 70 degrees of latitude.

One of the reasons for the location of Halley is that it is under the auroral oval, resulting in frequent displays of the Aurora Australis overhead.

Unlike Jupiter's, the Saturn's main auroral ovals are not related to the breakdown of the co-rotation of the plasma in the outer parts of the planet's magnetosphere.

The auroras generally occur along the "auroral ovals," which center on the magnetic poles (not the geographic poles) and roughly correspond with the Arctic and Antarctic circles.

In a more sophisticated model, the auroral oval between about 15 and 20 colatitude (again simulated by a coaxial auroral zone), as a transition zone between the field reversal, has been taken into account.

The instantaneous distribution of auroras ("auroral oval") is slightly different, centered about 3-5 degrees nightward of the magnetic pole, so that auroral arcs reach furthest toward the equator about an hour before midnight.

Ground-based data obtained during IGY demonstrated that the aurora occurred in an auroral oval, a permanent region of luminescence 15 to 25 degrees in latitude from the magnetic poles and 5 to 20 degrees wide.

With little light pollution, optimum weather conditions (very cold, with plenty of clear nights) and its position directly beneath the prime-viewing zone of the auroral oval, Churchill in Canada is one of the best places in the world to see the northern lights.

Travelling close to the Arctic Circle in the winter months holds the key, preferably on dates when there isn't a full moon (a rival light source) and to locations beneath the auroral oval that are not only far from light pollution but also blessed with good weather.