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auroral oval. auroral oval. An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
Relationship between Kp and the Aurora [ref] Right: From thousands of observations, Cornell University scientists have determined geographic subpoints for the southern edges of auroral displays. The curves represent four values of the planetary index (Kp). As this index increases, the aurora's southern edge moves southward. In this article we briefly explain some of the ideas behind the association of the aurora with geomagnetic activity and a bit about how the âK-indexâ or âK-factorâ works.