NASA | Fermi's Finds Radio Bursts...

NASA | Fermi's Finds Radio Bursts from Terrestrial Gamma-ray Flashes Lightning in the clouds is directly linked to events that produce some of the highest-energy light naturally made on Earth: terrestrial gamma-ray flashes (TGFs). An instrument aboard NASA's Fermi Gamma-ray Space Telescope was recently fine-tuned to better catch TGFs, and this allowed scientists to discover that TGFs emit radio waves, too.

http://buff.ly/WLPBDK