An Intense Terrestrial Gamma-ray Flash Observed at Ground Level

J Eric Grove1, Bernard F. Phlips2, Eric A. Wulf2, Anthony L. Hutcheson2, Lee J. Mitchell2, Richard S. Woolf2, W. Neil Johnson2, Meagan Schaal2, Martin A Uman3, Douglas Jordan4, Brian Hare4, Hamid K Rassoul5 and Alan Bozarth6, (1)Naval Research Lab DC, Washington, United States, (2)Naval Research Lab DC, Washington, DC, United States, (3)University of Florida, Gainesville, FL, United States, (4)Univ Florida, Gainesville, FL, United States, (5)Florida Institute of Technology, Department of Aerospace, Physics and Space Sciences, Melbourne, United States, (6)Florida Institute of Technology, Melbourne, FL, United States