http://apod.nasa.gov/apod/ap130311.html
http://www.thisiscolossal.com/2013/03/volcanic-lightning-photographed-by-martin-rietze/
Gallery of all the images here: http://www.mrietze.com/web13/japan13.htm
Explanation: Why does a volcanic eruption sometimes create lightning? Pictured above, the Sakurajima volcano in southern Japan was caught erupting in early January. Magma bubbles so hot they glow shoot away as liquid rock bursts through the Earth's surface from below. The above image is particularly notable, however, for the lightning bolts caught near the volcano's summit. Why lightning occurs even in common thunderstorms remains a topic of research, and the cause of volcanic lightning is even less clear. Surely, lightning bolts help quench areas of opposite but separated electric charges. One hypothesis holds that catapulting magma bubbles or volcanic ash are themselves electrically charged, and by their motion create these separated areas. Other volcanic lightning episodes may be facilitated by charge-inducing collisions in volcanic dust. Lightning is usually occurring somewhere on Earth, typically over 40 times each second.
http://www.thisiscolossal.com/2013/03/volcanic-lightning-photographed-by-martin-rietze/
Photographer Martin Rietze recently traveled to Japan where he had the incredible opportunity (or near grave misfortune?) of photographing the Sakurajima Valcano in southern Kyushu as it spewed forth smoke, fire, and lava bombs. If that wasnt enough the hellish volcano also caused a lightning show that lasted over 20 seconds giving the photographer ample time to flee for his life take these stunning photographs. You can see many more images from the series right here. Of note, the photographers grit and fearlessness landed the top photo a feature on NASAs Astronomy Picture of the Day earlier this week. (via spoon & tamago)
Gallery of all the images here: http://www.mrietze.com/web13/japan13.htm