Lightning current propagation speed estimation system and lightning current propagation speed estimation method

Abstract

To accurately estimate the propagation speed of lightning current. [Solution] The radio waves of the lightning discharge path 5 are observed by the radio wave observation means 1, and the propagation speed of the current propagating through the lightning discharge path 5 is derived by the control means 6 based on the inclination time, which is the time it takes for the lightning discharge path 5 to bend within the thundercloud 2, and the height of the thundercloud 2.

Claims

[Claim 1] A radio wave observation method for observing lightning radio waves, A means of determining the height of thunderclouds, A lightning discharge path estimation means estimates the slope time, which is the time it takes for the lightning discharge path to extend from the point of impact toward the thundercloud and bend within the thundercloud, based on the radio wave conditions observed by the aforementioned radio wave observation means. The system includes a propagation speed estimation means that derives the propagation speed of the current propagating through the lightning discharge path based on the slope time estimated by the lightning discharge path estimation means and the height of the thundercloud determined by the height determination means. A system for estimating the propagation speed of lightning current, characterized by the following: [Claim 2] In the lightning current propagation speed estimation system according to claim 1, The propagation speed estimation means is The system has a velocity derivation function that derives the propagation speed of lightning current propagating through the lightning discharge path by dividing the height of the thundercloud derived by the height determination means by the slope time estimated by the lightning discharge path estimation means. A system for estimating the propagation speed of lightning current, characterized by the following: [Claim 3] In the lightning current propagation speed estimation system according to claim 2, The height of the thundercloud as determined by the aforementioned height determination means is This is the altitude at which electric charge exists within the aforementioned thundercloud. A system for estimating the propagation speed of lightning current, characterized by the following: [Claim 4] In the lightning current propagation speed estimation system according to claim 3, The height of the thundercloud that the height-determining means determines is, This is the location at an altitude of -10°C within the aforementioned thundercloud. A system for estimating the propagation speed of lightning current, characterized by the following: [Claim 5] In a lightning current propagation speed estimation system according to any one of claims 1 to 4, Based on the information on the propagation speed of the lightning current obtained by the propagation speed estimation means, the system further includes a determination means that determines the current peak value, which is the value at which the current is at its maximum, and determines the extent of lightning damage caused by the lightning strike based on the determined current peak value. A system for estimating the propagation speed of lightning current, characterized by the following: [Claim 6] The propagation speed of the lightning current propagating through the lightning discharge path is estimated by estimating the slope time until the lightning discharge path bends within the thundercloud and the electric field strength decreases, and then dividing the height of the thundercloud by the aforementioned slope time. A method for estimating the propagation speed of lightning current, characterized by the following:

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