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首页> 外文期刊>Earth, planets and space: EPS >Diurnal variation of atmospheric Maxwell current over the low-latitude continental station, Tirunelveli, India (8.7°N, 77.8°E)
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Diurnal variation of atmospheric Maxwell current over the low-latitude continental station, Tirunelveli, India (8.7°N, 77.8°E)

机译：印度蒂鲁内尔维利低纬度大陆台站大气麦克斯韦电流的日变化（北纬8.7°，东经77.8°）

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摘要

Observations of atmospheric Maxwell current from the low-latitude continental station, Tirunelveli (8.7°N, 77.8°E), over a period of 8 years are presented in this study. The horizontal long-wire antenna is used as a sensor for picking up charges from the atmosphere. The objectives of the present work have been to understand the antenna system in response to different meteorological conditions and on fairweather days. We define a fairweather day as a day when there is no snowfall/rainfall at the measuring site, when there are high clouds less than 3 octas throughout the day, and when the wind speed is less than 10 m s-1. A sunrise effect is observed in the measured Maxwell current during fairweather days in all seasons. The measured current exhibits an increase that commences about 30 min before sunrise and lasts for nearly 1.5 h. The sunrise effect is found to be inhibited on days when there is pre-dawn convection and during the presence of rain, haze, or cloud cover. Barring the sunrise effect, the rest of the variations on fairweather day appear to follow a trend typical of the Carnegie curve. On clear cloudless conditions, reasonably good data are obtained during equinox and winter months but not in summer when strong winds associated with the onset of the southwest monsoon make the measurement of Maxwell current difficult and limited data are available.
机译：本研究介绍了低纬度大陆站蒂鲁内尔韦利（8.7°N，77.8°E）在8年中的大气麦克斯韦流观测结果。水平长线天线用作从大气层中收集电荷的传感器。当前工作的目的是了解天线系统对不同气象条件和晴天的反应。我们将天气晴朗的日子定义为测量地点没有降雪/降雨，整天的云量少于3个八度星且风速小于10 ms -1 。在所有季节的晴天期间，在测得的麦克斯韦电流中观察到日出效应。实测电流呈现出增加，该增加在日出之前约30分钟开始，持续近1.5 h。发现在黎明前对流的日子以及在有雨，霾或云层的情况下，日出效果会受到抑制。除日出效应外，其余在晴天的变化似乎遵循卡内基曲线的典型趋势。在晴朗无云的条件下，在春分和冬季期间会获得相当好的数据，而在夏季，由于西南季风的爆发带来的强风使麦克斯韦流的测量变得困难并且数据有限，因此无法获得。

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