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This image shows the expanding auroral oval.
Click on image for full size
L. Frank

The Expanding Auroral Oval

This figure shows a series of images of the auroral oval as it expands over the course of about an hour in response to a geomagnetic storm.

This is an animation of the auroral oval expanding.

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AU stands for Astronomical Units. It is a useful way to measure the distances in interplanetary space. It is the distance between the Earth and the Sun, which is about 93 million miles. For reference,...more

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The aurora we are most familiar with is the polar aurora. This is what people are talking about when they say the northern or southern lights. But there are other less-known aurora, such as SAR arcs....more

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The forming Aurora

This picture shows the flowing of particles into and out of the auroral zone, as Field-Aligned currents (FAC's) take at short-cut through the atmosphere. Some of the particles entering the auroral zone...more

The Expanding Auroral Oval

This figure shows a series of images of the auroral oval as it expands over the course of about an hour in response to a geomagnetic storm. This is an animation of the auroral oval expanding....more

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