auroral oval

auroral oval

[ə′rȯr·əl ′ō·vəl]
(geophysics)
An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
References in periodicals archive ?
Sometimes we receive an extra large flare from the Sun which causes the auroral oval to expand and reach further south to much lower latitudes.
And because Fairbanks sits in an auroral oval, we also have fantastic Northern lights viewing--in fact, our hotels even offer Northern Lights' wake-up calls.
This has the effect of allowing the vertical component of the interplanetary magnetic field (Bz) to connect with the magnetic field of the Earth more frequently, when charged particles from the solar wind can spiral down the field lines towards the polar regions and the auroral oval.
The northern auroral oval is slightly smaller and more intense than the southern one, implying that Saturn's magnetic field is not equally distributed across the planet; it is slightly uneven and stronger in the north than the south.
The necklace lights we see around the earth's magnetic poles are caused by this increase of atomic particles charging Earth's magnetic field and creating an auroral oval of high-altitude gases.
some times, we receive an extra-large flare from the Sun, which causes the auroral oval to expand and reach out further south to much lower latitudes.
There is a phenomenon called the auroral oval, which is essentially a halo that goes around the globe at a latitude north of the Arctic Circle--that is where the auroral activity is concentrated.
In the northern hemisphere the auroral oval bulges further south, the stronger the solar wind.
Sometimes we receive an extra-large flare from the Sun which causes the auroral oval to expand and reach out further south to much lower latitudes.
Whether you live in a location that experiences frequent auroral displays or prefer to wait for a strong geomagnetic display to push the auroral oval down to your latitude, you can monitor solar activity to know the best time to head out to shoot.
In the southern hemisphere the auroral oval lies mostly over Antarctica and the southern oceans surrounding it, but in the north the oval crosses Alaska, northern Canada, Greenland, Scandinavia and northen Siberia.