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首页> 美国政府科技报告 >Low-Pressure Electrical Discharge Experiment to Simulate High-Altitude LightningAbove Thunderclouds
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Low-Pressure Electrical Discharge Experiment to Simulate High-Altitude LightningAbove Thunderclouds

机译：低压电气放电实验模拟雷云云高空闪电

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Recently, extremely interesting high-altitude cloud-ionosphere electricaldischarges, like lightning above thunderstorms, have been observed from NASA's space shuttle missions and during airborne and ground-based experiments. To understand these discharges, a new experiment was conceived to simulate a thundercloud in a vacuum chamber using a dielectric in particulate form into which electrodes were inserted to create charge centers analogous to those in an electrified cloud. To represent the ionosphere, a conducting medium (metallic plate) was introduced at the top of the chamber. It was found that for different pressures between approximately 1 and 300 mb, corresponding to various upper atmospheric altitudes, different discharges occurred above the simulated thundercloud, and these bore a remarkable similarity to the observed atmospheric phenomena. At pressures greater than 300 mb, these discharges were rare and only discharges within the simulated thundercloud were observed. Use of a particulate dielectric was critical for the successful simulation of the high-altitude lightning.

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