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闪电活动
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  lightning activity
    The relationship between Lightning Activity and Severe Convection Weather in Beijing Area in summer from 1995 to 1997
    北京地区闪电活动及其与强对流天气的关系
短句来源
    Global Lightning Activity and Climate Change
    全球闪电活动与气候变化
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    ANALYSIS OF LIGHTNING ACTIVITY OVER THE YANGTZE RIVER DELTA USING TRMM/LIS OBSERVATIONS
    用TRMM/LIS资料分析长江三角洲地区的闪电活动
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    It shows that it will be useful for forecaster and the service to predict the tendency of lightning activity correctly according to the character of Doppler radar image.
    这表明,通过对多普勒雷达速度图像特征进行分析,能够对雷暴天气闪电活动演变趋势作出预测,这对于闪电短时预报工作具有重要的指导价值。
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    Meanwhile, the role of aerosol and thermodynamic electrification processes and lightning activity are discussed.
    同时,文中还对影响闪电活动和起电过程的热力动力作用以及气溶胶的作用等进行了分析。
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  lightning activities
    GLOBAL LIGHTNING ACTIVITIES AND THEIR REGIONAL DIFFERENCES OBSERVED FROM THE SATELLITE
    卫星观测到的全球闪电活动及其地域差异
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    Temporal and Spatial Distributions of Lightning Activities along Qinghai-Xizang Railway
    青藏铁路沿线闪电活动的时空分布特征
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    Regional responses of lightning activities to relative humidity of the surface
    区域闪电活动对地面相对湿度的响应
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    The SVD analysis technique further suggests that there are a good relationship between SST in the regions of 20°~30°S, 110°~130°W and 10°~5°N, 160°W~180° and the lightning activities in Peru and east Brazil, but the variation of SST results in different variation tendencies in Peru and east Brazil.
    SVD分析发现,20°~30°S,110°~130°W和10°~5°N,160°W~180°区域的海温异常和南美秘鲁及巴西东部的闪电活动有很好的相关关系。
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    SPATIAL AND TEMPORAL DISTRIBUTION OF LIGHTNING ACTIVITIES OVER THE TIBETAN PLATEAU
    青藏高原闪电活动的时空分布特征
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  “闪电活动”译为未确定词的双语例句
    The diurnal variation of the flash activity shows a peak activity from 14:00 to 18:00 LT with 63% of all flash activities occuring in this period. Less than 3% of all lightning flashes are observed between 00:00~10:00 LT.
    63%的闪电活动发生于14:00~18:00(地方时,下同)之间,而只有<3%的闪电发生于00:00~10:00之间。
短句来源
    Our results show that the mean flash density over the Tibetan plateau is 3 fl·a -1·km -2, and the maximum flash activity is over the Central Plateau around (32°N, 88°E) with a peak value of 5.1 fl·a -1·km -2. The flash activity on the Plateau exhibited a seasonal variation and mainly occurs from June to August with a maximum flash activity period from late June to middle July.
    结果表明 ,高原上的平均闪电密度为3fl·a-1·km-2 ,并在高原中部 (32 °N ,88°E)出现闪电密度峰值 5 .1fl·a-1·km-2 .闪电活动主要发生在 6~ 8月 ,并在6月下旬至 7月中旬最为活跃 .
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    Based on the synthetical analysis of lightning data and Doppler radar echoes from a severe storm event in Henan Province on 19 June 2003, relationship is found between lightning frequency and radar echo intensity.
    根据2003年6月19日河南一次强风暴天气的闪电定位资料和714CD雷达资料,利用统计和对比分析的方法,发现了闪电活动与雷达强度回波之间存在如下关系:闪电发生频数、强度和雷达回波强度在时间序列上有较好的一致性;
短句来源
    The daily variation of CG lightning flashes assumes a form of unimodal undulance,with the peak over 60 times from 18:00 to 21:00 and at 01:00 and the valley below 10 times from 10:00 to 13:00.Lightning flashes occur more frequently at night than in the daytime.
    地闪活动具有明显的日变化,总体呈单峰单谷形式,地闪频次在60以上的峰值时段是18:00~24:00和01:00,频次在10以下的谷值时段是10:00~13:00,夜间闪电活动明显大于日间。
短句来源
    Spatial and Temporal Distributions of Lightning Activitiesin China from Satellite Observation
    卫星观测到的我国闪电活动的时空分布特征
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  lightning activity
Lightning activity and precipitation structure of hailstorms
      
The precipitation structure and lightning activity in two typical hailstorms are studied in detail.
      
The mean diurnal and annual variations of the VLF level are determined by the occurrence of lightning activity.
      
The results indicate that the monthly lightning activity in Gaborone increases by an order of magnitude for every 2°C rise in wet bulb temperature.
      
Periods of continuous rain over a few days were generally characterised by a fall in the wet bulb temperature with a corresponding decrease in lightning activity.
      
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  lightning activities
The mean time between power transformer insulation failures is computed taking into account the monthly distribution of the lightning activities and also the monthly probability distribution of certain substation configurations.
      
The main results of studies of the spatial-temporal characteristics of lightning activities over the area of Siberia and Kazakhstan are reported.
      
Research has been done to seek the relation between summer lightning activities and power outages.
      
The mergers favor the transforming of water vapor and the forming of cloud ice and graupel and enhance lightning activities.
      


The characteristics of lightning flash rate' of hailclouds are summari-zed, which were observed during 1976 to 1979 in Piugliang, Gansu, with a double channel. lightning counter. It is found that the flash rate depen-ds on precipitation property ( hail 6r rain ) and is much higher in hailc-loud than in thunderstorm cloud. A simple and practical index that the f-lash number during 5 minutes is more of less than 100 can be used to jud-ge whether or not there are hailcuds.within 40km from the observation site....

The characteristics of lightning flash rate' of hailclouds are summari-zed, which were observed during 1976 to 1979 in Piugliang, Gansu, with a double channel. lightning counter. It is found that the flash rate depen-ds on precipitation property ( hail 6r rain ) and is much higher in hailc-loud than in thunderstorm cloud. A simple and practical index that the f-lash number during 5 minutes is more of less than 100 can be used to jud-ge whether or not there are hailcuds.within 40km from the observation site. The. forecast accuracy is above 80% and the wrong and missing Irate are 9.4% arid 11.1%, respectively. 'A comparison is made between time variation of flash rate and that .of intensiv'fe radar echo (36dbz ) height. It is found that there is apparently a positive correlation between5 them and that the time when hailcloud is identified both by radar index and by that of lightning counter is nearly, the same, This suggests that under cer-tain circumstances the extent of lightning activity could be used to charac-terize the intensity of thunderstorm, and which can be seen f rom the. f act that when clouds are merging, the vigorous development of the merging C louds is always followed by an abrupt flash rate increase.

本文总结了1976—1979年在甘肃平凉地区用双通道闪电计数器所观测的冰雹云闪电频数的特征。观测表明雷暴云的闪电频数与降水物有关:冰雹云的闪电频数远大于雷雨云;用5分钟累计的闪电数等于、大于100次这样一个简易指标可以识别测站40公里范围内有无冰雹云,其成功率为80%以上,漏报和空报率平均在10%左右。文中还将闪电频数随时间的演变与雷达强回波(36dbz)顶高随时间的演变进行了对比,发现二者有明显的正相关;雷达识别冰雹云指标和闪电计数器识别冰雹云指标在时间上也基本是一致的。这说明闪电活动程度在一定条件下可以代表雷暴云的强度,云合并时云体迅速发展、闪电数猛增也说明了这一点。此外,文中还对冰雹云闪电频数高的原因进行了初步讨论,並指出了闪电计数器观测中应注意的一些问题。

Some characteristics of the ground electric field, precipitation, corona current and lightning flash are described when a thunder cloud was overhead in Dongxiang,Gansu Province in the summer of 1985. Observation and analysis show that the high and persistent positive electric field on the ground is due to the positive charge region in the lower portion of the clouds,while the fast transitions of the electric field from negative to positive and positive to negative are mainly the consequence of the positively...

Some characteristics of the ground electric field, precipitation, corona current and lightning flash are described when a thunder cloud was overhead in Dongxiang,Gansu Province in the summer of 1985. Observation and analysis show that the high and persistent positive electric field on the ground is due to the positive charge region in the lower portion of the clouds,while the fast transitions of the electric field from negative to positive and positive to negative are mainly the consequence of the positively charged raindrops falling from the cloud base. The heavy rain and the frequent lightning flashes during the positive electric field on the surface suggest that there is a powerful and precipitation-associated mechanism of electrification in thunderclouds, which makes raindrops charged positively and the lower positive charge center persist long. The life time, the dimensions and the formation cause of the lower positive charge center of the thundercloud we observed are quite different from that reported by Holden et al. ( 1980 ) and Marshall et al. ( 1982 ) .

人们对雷云下部局部的正电荷区迄今还了解得不多。本文介绍的是1985年夏季在甘肃东乡地区一次雷暴过顶时地面电场、降水、电晕电流以及闪电活动的一些特征。观测与分析表明地面上强而持续的正电场是由云下部的正电荷区所产生的,而电场由负到正及由正到负过渡时的快速变化率主要是从云底下落的带正电的雨滴群的贡献。在地面正电场控制时较强的降水及频繁的闪电表明,云中有一种强而有力的、与降水形成有关的起电机制在起作用。它使雨滴带上正电荷并维持云下部正电荷区历久不衰。本文所介绍的雷云下部的正电荷区在时间、空间的尺度上以及形成原因方面与Holden等人(1980)和Marshall等人(1982)所报导的结果颇为不同。

This system is designed to run on IBM PC AT 286 or compatible computers that support EGA graphics. The real-time mode is used to process, display and store all lightning positions data. The display receives flash data from the Position Analyzer (PA), checks transmission data format, and sends processed flash data to users in real-time or after every pre-set interval. The lightning activity and moving path with different geographic background can be monitored conveniently on the screen. In the data inquiring...

This system is designed to run on IBM PC AT 286 or compatible computers that support EGA graphics. The real-time mode is used to process, display and store all lightning positions data. The display receives flash data from the Position Analyzer (PA), checks transmission data format, and sends processed flash data to users in real-time or after every pre-set interval. The lightning activity and moving path with different geographic background can be monitored conveniently on the screen. In the data inquiring mode, the lightning data of any time interval, any where within the maximum region may be inquired, displayed, and calculated for total number of negative and positive. The sectional region may be amplified by setting the coordinate of region on main menu. The screen also can show the total lightning numbers of every hour of the day inquired. The display system supports eight pen ploter (SPL-450). The lightning graphics displayed on the screen can be plotted on a plotter or printer.

本系统与LLP公司出品的闪电位置分析仪连为一体,可以实现闪电资料实时处理、显示地闪位置和自动整理、记录闪电数据,定时或实时向用户传送闪电数据,并能以不同的地理图为背景及时反映闪电活动演变规律及移动路径,显示雷电图直观形象。也可实现闪电资料的格式化处理及向用户提供接口,为研究、统计、分析雷电资料提供了方便。新研制的系统与原系统一起组成了一个完整的雷电观测网络,扩大了其应用功能,提高了应用效益。

 
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