• 作者： 吳清吉; 陳英
• 作者服務機構： 國立臺灣大學大氣科學系
• 中文摘要： 本文利用國立臺灣大學大氣科學系觀測場所裝置之閃電計次器在1977至1980年每年夏季所
  接收到之閃電資料，分析臺北地區閃電之日變化。由接收到的74個雷雨個案的統計分析，得知
  閃電發生次數的變化高?在13時至16時之問，6月中至7月中及9月中至10月中的高峰較7
  月中至9月中的高?時間落後一至二小時。6月中至8月中閃電發生較集中於12時至18時之間
  ，而8月中至月中則較分散，約有20～30%的閃電不是在上述時間發生。R <0.6的閃電可在一
  天中任何時間產生，但R 0.6的閃電多集中在午後發生，R 0.9的閃電，在17時以後則很
  少發生。
  d
• 英文摘要： Data collected in the summers of 1977 to1980 by the lightning-flash counter installed atthe Meteorological Observation Field of Atmos-pheric Sciences, National Taiwan University,are analyzed in order to understand the diurnalvariations of flashing rates in Taipei. Fromthe study of lightning flashes selected from 74thunderstorms, it is found that the peaks ofdiurnal variation occur between 1300 and 1600LT. The peaks in the two months from Mid－June to Mid-July and from Mid-September toMid-October are 1 to 2 hours later than thosein the two months from Mid-July to Mid-September. From Mid-June to Mid-August,lightnings usually occur between 1200 and1800 LT, but from Mid-August to Mid-Octoberabout 20-30% of the lightnings do not occurin these hours. Lightnings with R ＜0.6 canoccur in any time of the day, whereas thosewith R 0.6 usually are in the afternoon andthose with R 0.9 are seldom recorded after1700 LT.
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