Terrestrial Gamma-ray Flashes, More Common Than Previously Thought?

Source - NASA Science News for Dec. 31, 2014

New research shows that terrestrial gamma-ray flashes arise from an unexpected diversity of thunderstorms storms and may be more common than previously thought.

The complete article can be found here: http://science.nasa.gov/science-news/science-at-nasa/2014/31dec_tgfs/