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Measurement and Verification of Lightning Return-Stroke Velocities

Measurement and Verification of Lightning Return-Stroke Velocities. Samantha Tabor Matthew Jay Genesis Langum Mentor: Dr. Danyal Petersen. What Are W e I nvestigating?.

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Measurement and Verification of Lightning Return-Stroke Velocities

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  1. Measurement and Verification of Lightning Return-Stroke Velocities Samantha Tabor Matthew Jay Genesis LangumMentor: Dr. Danyal Petersen

  2. What Are We Investigating? • We will be using a high speed camera and an avalanche photodiode array to estimate the two-dimensional velocity of lightning return strokes. 1 2 3 4

  3. How Will We Do This? • Observations and data gathering via: • High speed camera • Avalanche photo diode array • Flat plate antenna (electric field) • Data processing and viewing • PhotronFastcam Viewer 3 • Waveform viewing application (DF32) Avalanche Photo Diode High Speed Camera Flat Plate Antenna

  4. How Will We Do This? • Combine this with LMA data and possibly lightning detection network • Provides linear velocities of lightning return-strokes • Compare velocities to past calculations

  5. Why Is This Important? • Inconsistent return-stroke velocity measurements • Further understanding of lightning behavior • Aid in future scientific discoveries • Direct implication for other projects • Ex. Defense Advanced Research Projects Agency (DARPA) • Ex. Better engineering of strike-prone equipment

  6. Our Goals Analyze as many return strokes as time permits Have at least one example of positively-charged lightning Provide useful data for further study

  7. Selected References Boyle, J. S., and R. E. Orville, 1976: Return stroke velocity measurements in multistroke lightning flashes. J. Geophys. Res,, 81(24), 4461-4466. Chowdhuri, et. al., 2003: Parameters of Lightning Strokes: A Review. IEEE Trans. Power Delivery, 20(1), 346-358, doi:10.1109/TPWRD.2004.835039. Idone, V. P., and R. E. Orville, 1982: Lightning return stroke velocities in the thunderstorm research international program (TRIP). J. Geophys. Res., 87(C7), 4903-4915. Mach, D., and W. D. Rust, 1989: Photoelectric return stroke velocity and peak current estimates in natural and triggered lightning. J. Geophys. Res., 94(D11), 13237-13247. Nakano, et al., 1988: Measurements of the Velocity Change of a Lightning Return Stroke With Height. Proc. 1988 International Aerospace and Ground Conf. on Lightning and Static Electricity, Oklahoma City, OK, National Oceanic and Atmospheric Administration, 84-86. Rakov, V., 2007: Lightning return stroke speed. J. Lightning Res., 1, 80-89. Wagner, C.F., 1963: The Relation Between Stroke Current and the Velocity of the Return Stroke. IEEE Trans. Power Appar. Syst., 82, 609-617, doi:10.1109/TPAS.1963.291375.

  8. Any Questions?

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