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Imaging Lightning Progression Using VHF Broadband Radio Interferometry
Redy MARDIANA Takeshi MORIMOTO Zen-Ichiro KAWASAKI
IEICE TRANSACTIONS on Electronics
Publication Date: 2001/12/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
interferometry, broadband interferometry, lightning, electromagnetic wave, remote sensing,
Full Text: PDF(2.3MB)>>
The VHF broadband radio interferometry operated from 25 MHz to 250 MHz has been developed for observing lightning discharge progression. The lightning images are derived by sensing the electromagnetic-waves which are radiated during the discharges. The perpendicular baseline geometry provides the angular locations (azimuth and elevation) of lightning radiation sources. The lightning observations have been conducted in the Hokuriku District in 1999. The station consisted of three broadband antennas and an electric field antenna as well as a GPS receiver. The system was able to reconstruct lightning discharge channels in two-spatial dimensions and in time sequence. As one of the observation results, an upward negative cloud-to-ground lightning flash will be presented.