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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Changes in measured lightning flash count and return stroke peak current after the 1994 U. S. National Lightning Detection Network upgrade 1. Observations
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Changes in measured lightning flash count and return stroke peak current after the 1994 U. S. National Lightning Detection Network upgrade 1. Observations

机译：1994年美国国家闪电检测网络升级后，测得的闪电计数和回程峰值电流的变化1.观察

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摘要

A total of more than 134 million cloud-to-ground lightning flashes (127 million negative, 7 million positive), occurring during 1989-1995 in the continental United States, have been studied on a monthly and yearly basis for variations in flash count, first stroke peak current, and polarity. The years 1989-1993 cover a period in which similar instrumentation was used throughout the United States. In 1994 the National Lightning Detection Network (NLDN) underwent a system-wide upgrade to improve location accuracy and detection efficiency. As a result of this upgrade, we observe in the NLDN that the negative mean peak current decreased from a preupgrade (1989-1993) mean of 37.5 kA to a 1995 value of 30.2 kA, a decrease of 3.4 standard deviations. The positive mean peak current decreased from 54.4 to 31.6 kA, a 5.0 standard deviation decrease. The NLDN negative flash count increased 1.2 standard deviations, from a preupgrade mean of 16.7 million flashes yr~(-1) to 20.6 million flashes in 1995. The positive flash count increased 6.2 standard deviations, from an average of 696,000 flashes yr~(-1) before the upgrade to 2.1 million flashes in 1995. Both the negative and the positive flash count increases were predominantly at low peak currents.
机译：在1989-1995年期间，美国大陆上每月和每年共进行了超过1.34亿次云对地闪电（1.27亿负，700万正）的闪烁计数研究，第一冲程峰值电流和极性。 1989-1993年涵盖了整个美国使用类似仪器的时期。 1994年，国家雷电检测网络（NLDN）进行了全系统升级，以提高定位精度和检测效率。作为此升级的结果，我们在NLDN中观察到负平均峰值电流从升级前（1989-1993年）的平均值37.5 kA降低到1995年的值30.2 kA，降低了3.4个标准差。正平均峰值电流从54.4 kA降低到31.6 kA，标准差降低了5.0。 NLDN负闪光计数增加了1.2个标准差，从升级前的平均1670万闪光yr〜（-1）到1995年增加了2060万闪光。正闪光计数增加了6.2个标准差，从平均每年696,000个闪光yr〜（- 1）在1995年升级为210万次闪光之前。负和正闪光计数的增加主要是在低峰值电流下。

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