Iceland Volcano Pictures: Lightning Adds Flash to Ash

Purple Bolts at Iceland Volcano

Photograph by Marco Fulle, Barcroft/Fame Pictures

Italian photographer and scientist Marco Fulle flew at sunset on Sunday over Iceland's erupting Eyjafjallajökull volcano to capture this picture of purple lightning bolts streaking through the sky.

Much of the lightning generated by the Iceland volcano is better termed long sparks, said the University of Florida's Uman. Those may include a new type of lightning recently found over an Alaska volcano.

It's unknown how such sparks form, though one possibility is that electrically charged silica—an ingredient of magma—interacts with the atmosphere when it bursts out of Earth's crust, Steve McNutt of the Alaska Volcano Observatory said in February.

(Related: "Iceland Volcano Pictures: Aerial Views of the Inferno.")

Published April 19, 2010

Fire, Ice, and Lightning

Photograph by Rakel Orvar Atli Thorge, NordicPhotos/Getty Images

Fiery lava mixes with blue ash and golden lightning over the erupting Eyjafjallajökull volcano in an April 18, 2010, picture.

The Iceland volcano's lightning is probably creating distinct symphony of sounds, said the University of Florida's Uman. For instance, small sparks of about 30 feet (9 meters) to about 300 yards (91 meters) make sounds like rifle shots, while the miles-long bolts produce the deep, familiar rumbling we associate with thunderstorms, he explained.

(Also see "Pictures: Iceland Volcano Erupts, Under Ice This Time.")

Published April 19, 2010

Stormy Mix at Iceland Volcano

Photograph by Marco Fulle, Barcroft/Fame Pictures

Pictured Sunday, lightning at the Eyjafjallajökull volcano branches off in many directions—an interesting phenomenon, according to the University of Florida's Uman.

Every bolt has a direction that it travels, Uman explained: A spark begins in electrically charged spot and then travels either up, down, or sideways until it reaches an oppositely charged area.

(Related: "Iceland Volcano Pictures: Lava Explodes From Ice Cap.")

Published April 19, 2010

Lava and Lightning in Iceland

Photograph by Oli Haukur Myrdal, Your Shot

Spurts of lava mix with lightning over Iceland's Eyjafjallajökull volcano on Sunday.

National Geographic Your Shot submitter Oli Haukur Myrdal captured the electrifying light show.

All types of lightning, particularly volcanic lightning, are still largely mysteries to scientists, University of Florida's Uman said.

Since people can't easily get inside thunder and lightning storms, no one knows exactly how they form, he said. However, scientists can install instruments near volcanoes' vents to measure certain data, such as the lightning-detection devices that scientists are installing right now in Iceland, he said.

.(Related: "Iceland Volcano Pictures: Eruption Sparks Tourist Boom.")

Published April 19, 2010

Flash and Ash at Volcano

Photograph by Olivier Vandeginste,  Your Shot

Lightning pierces the erupting volcano's ash cloud in a National Geographic Your Shot photograph taken by Olivier Vandeginste on Sunday.

Inhaling the tiny pieces of glassy sand and dust in the cloud can cause irritation of the eyes, nose, and throat, say experts who advise Europeans to stay indoors when the ash begins to fall. Finer particles can also penetrate deep into the lungs and cause breathing problems, particularly among those with respiratory issues like asthma or emphysema. (See "Iceland Volcano Ash Plume Prompts Health Worries.")

But if people could witness the volcanic lightning safely, it would be an incredible experience, Uman said.

"Everyone would want to see that," Uman said. "It's like going to see aurora borealis near the North Pole—it's a once-in-a-lifetime experience."

(Also see "Photos: Chile Volcano Erupts With Ash and Lightning.")

Published April 19, 2010