AN ELVE OVER ITALY: This week, an enormous red ring appeared in the night sky above Italy, so wide that it straddled the Adriatic Sea. A photographer caught the split-second apparition, which researchers call an "ELVE". It was caused by an EMP from unusually powerful lightning. The sighting marks the beginning of ELVE season in the northern hemisphere. Full story @ Spaceweather.com.
"This is an "ELVE"--short for Emissions of Light and Very Low Frequency Perturbations due to Electromagnetic Pulse Sources. It's a rare species of sprite discovered in 1990 by cameras onboard the space shuttle. Binotto may have just taken the best ever picture of one from the ground.
"The ELVE was generated by intense lightning in a storm near Ancona about 285 km south of me," says Binotto. One bolt was so strong, it generated an intense electromagnetic pulse (EMP). The red ring marks the spot where the EMP hit Earth's ionosphere. Normal lightning bolts carry 10 to 30 kilo-ampères of current; this bolt was about 10 times stronger than normal.
Binotto created a graphic showing the scale of the ELVE:
"It was about 100 km high and nearly 360 km wide," says Binotto. "I have been photographing upper atmospheric lightning and transient luminous events (TLEs) since 2019, hundreds of them, and this is one of the biggest structures I have ever seen."
ELVE season is just getting started in Europe and North America, where spring and summer thunderstorms will multiply in the months ahead. Photographers should be alert for red rings and many other things above the cloudtops. Look here. "
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