Evidence for Extended Charging Periods Prior to Terrestrial Gamma-Ray Flashes

Reyann Kathleen Larkey1, John Glen Sample1, David Smith2, Michael S Briggs3, Jeff Lapierre4 and Robert H Holzworth II5, (1)Montana State University, Bozeman, MT, United States, (2)University Of California Santa Cruz, Santa Cruz, CA, United States, (3)UA Huntsville, Huntsville, AL, United States, (4)Earth Networks Inc., Germantown, United States, (5)University of Washington, Department of Earth and Space Sciences, Seattle, WA, United States