Remote sensing of lightning return stroke current parameters: feasibility and uncertainty

Boayou Zhu; Shanchang Tao

doi:10.1117/12.317731

18 August 1998 Remote sensing of lightning return stroke current parameters: feasibility and uncertainty

Boayou Zhu, Shanchang Tao

Proceedings Volume 3501, Optical Remote Sensing of the Atmosphere and Clouds; (1998) https://doi.org/10.1117/12.317731
Event: Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 1998, Beijing, China

Abstract

Recently, lightning location system with LF/VLF bandwidth has been widely used in the world, therefore it is interesting to investigate the feasibility and uncertainty of deriving lightning return stoke current parameters from remote electromagnetic fields measured by lightning location system. Calculations are presented to check the validity of the electric field expression which was given by Uman [1970] on hypothesis of Transmission Line Model (TLM), and the results show that TLM somewhat underestimates the peak of the currents and the risetime of current deduced from the model may be unconvincing. A modified expression dealing with the peak of electric field vs. the current is developed by using modified transmission line model as well as taking into account propagation attenuation and effect of slant lightning certainty of the derived current peak depends on the truth of the assumed return stroke (RS) velocity and the precision of measured electric field and distance. Due to propagation effect the risetime of the electric field is different from that of the current and the increase of the rise of the electric field against that of the current varies with propagation conditions and the current waveform. The risetime of current waveform can be roughly estimated form that of the electric field waveform, but there exists considerable uncertainty due to uncertainty of assumed ground conductivity.

Citation Download Citation

Boayou Zhu and Shanchang Tao "Remote sensing of lightning return stroke current parameters: feasibility and uncertainty", Proc. SPIE 3501, Optical Remote Sensing of the Atmosphere and Clouds, (18 August 1998); https://doi.org/10.1117/12.317731

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KEYWORDS

Signal attenuation

Radio propagation

Light wave propagation

Electromagnetism

Remote sensing

Information operations

Wave propagation

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