Observation of two downward terrestrial gamma-ray flashes with very-high-frequency waveform recordings
Yuuki Wada, Osaka University, Osaka, Japan, Takeshi Morimoto, Kindai University, Osaka, Japan, Yoshitaka Nakamura, Kobe City College of Tech., Kobe, Japan, Teruaki Enoto, Kyoto University, Kyoto, Japan, Hiroshi Kikuchi, University of Electro-Communications, Tokyo, Japan, Eiichi Yoshikawa, Japan Aerospace Exploration Agency, Aeronautical Technology Directorate, Tokyo, Japan and Tomoo Ushio, Osaka University, Department of Engineering, Suita, Japan
