In today's image, we see a type of aurora known as a SAR (Stable Red Auroral) arc. The phenomenon has only been studied for the past 70 years or so and is still not completely understood.

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This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

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