冬季雷と雲内放電進展様相

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タイトル別名
  • Lightning Activity During Winter Thunderstorm and Leader Progression in Thundercloud
  • トウキ ライ ト ウンナイ ホウデン シンテン ヨウソウ

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We have been observing lightning discharges by UHF Interferometer, and we show comparison between lightning during winter thunderstorms and during summer ones. The main objective of the comparison is further understanding of features of lightning during winter storms, especially of positive cloud to ground flashes. For this purpose we compare negative and positive flashes on UHF radiation and pulse density, and we perform two dimensional mappings of UHF radiation sources. Moreover we show the three dimensional imaging for a cloud flash, and we discuss the relationship between the altitude of leader progressions and atmospheric temperature profiles as a function of height. We also show the estimated velocite of leader progressions and find no discrepancy with the former results obtained by Proctor.

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