在斯里兰卡及印度洋周边地区观测到的云对地闪电活动

Sri Lankan Journal of Physics Pub Date : 2001-12-17 DOI:10.4038/SLJP.V2I0.177

A. Weerasekera, D. Sonnadara, I. Fernando, Jp Liyanage, R. Lelwala, T. Ariyaratne

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引用次数: 5

摘要

生日科伦坡大学生日11.6568正常0假假假假MicrosoftInternetExplorer4 st1\:*{behavior:url(# ieoui)} /*样式定义*/表。mso-style-name:"Table Normal";mso-tstyle-rowband-size: 0;mso-tstyle-colband-size: 0;mso-style-noshow:是的;mso-style-parent:“”;Mso-padding-alt:0cm 5.4pt;mso-para-margin: 0厘米;mso-para-margin-bottom: .0001pt;mso-pagination: widow-orphan;字体大小:10.0分;font-family:宋体;mso-ansi-language: # 0400;mso-fareast-language: # 0400;本文介绍了由两个测向仪组成的闪电定位系统在斯里兰卡季风雷暴期间观测到的云对地闪电活动。东北季候风产生超过884次云对地闪电，峰值闪电率为每小时96次;而西南季候风则产生3294次云对地闪电，峰值闪电率为每小时104次。在拉特纳普拉地区(北纬6.68度，东经80.40度)观测到的闪光密度最高为198次/ 28×28 km 2。在10 ~ 250 km范围内，东北季风期正闪率为6.4%，负闪率为36 kA，西南季风期正闪率为1.7%，负闪率为40 kA。负闪和正闪的平均峰值雷电电流值在两个季风中无显著差异。doi:10.4038/sljp.v2i0.177斯里兰卡物理学报Vol.2 (2001) 13-19

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Activity of cloud-to-ground lightning observed in Sri Lanka and in surrounding area of the Indian Ocean

Birthday UNIVERSITY OF COLOMBO Birthday 11.6568 Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Activity of cloud-to-ground lightning flashes observed during the monsoon thunderstorms over Sri Lanka with a lightning locating system consisting of two direction finders (DF) is presented. The Northeast monsoon produced over 884 cloud-to-ground flashes with a peak lightning rate of 96 flashes per hour whereas Southwest monsoon produced 3,294 flashes with a peak rate of 104 flashes per hour. A relative flash density maximum of 198 flashes per 28×28 km 2 was observed over Ratnapura area (6.68N, 80.40E). The percentage of positive flashes and average peak lightning current values for negative flashes are found to be 6.4% and 36 kA respectively for the Northeast monsoon period and 1.7% and 40 kA respectively for the Southwest monsoon period for the flashes that struck within 10-250 km range. No significant difference in average peak lightning current values were observed for the negative and positive flashes in both monsoons. doi:10.4038/sljp.v2i0.177 Sri Lankan Journal of Physics, Vol.2 (2001) 13-19

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Sri Lankan Journal of Physics

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