Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2022 September 12
The featured image shows a dark sky with many
complex red streakes. 
Please see the explanation for more detailed information.

Red Sprite Lightning over the Czech Republic
Image Credit & Copyright: Daniel Ščerba

Explanation: What are those red filaments in the sky? They are a rarely seen form of lightning confirmed only about 35 years ago: red sprites. Research has shown that following a powerful positive cloud-to-ground lightning strike, red sprites may start as 100-metre balls of ionized air that shoot down from about 80-km high at 10 percent the speed of light. They are quickly followed by a group of upward streaking ionized balls. The featured image was taken late last month from the Jeseniky Mountains in northern Moravia in the Czech Republic. The distance to the red sprites is about 200 kilometres. Red sprites take only a fraction of a second to occur and are best seen when powerful thunderstorms are visible from the side.

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