What does the Kp-index measure regarding the behavior of the auroral oval?

Answer

The level of geomagnetic disturbance

The Kp-index serves as a scale to track the level of geomagnetic disturbance. Higher values indicate more intense solar activity, which causes the auroral ovals to expand and shift toward lower latitudes, potentially making the lights visible in areas that do not typically experience them.

What does the Kp-index measure regarding the behavior of the auroral oval?

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