The Origin Of Theta Auroras Revealed

Auroras are the most visible manifestation of the sun's effect on Earth, but many aspects of these spectacular displays are still poorly understood. One particular type of very high-latitude aurora is known as a theta aurora -- seen from above it looks like the Greek letter theta, an oval with a line crossing through the center -- which sometimes occurs closer to the poles than normal aurora. While the genesis of the auroral oval emissions is reasonably well understood, the origin of the theta aurora has been undetermined. read more

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