Lightning Activity during Winter Thunderstorm Season Observed by SAFIR

DOI Web Site Web Site 2 Citations 17 References

Bibliographic Information

Other Title
  • SAFIRによる冬季雷観測結果
  • SAFIR ニ ヨル トウキ カミナリ カンソク ケッカ

Search this article

Abstract

Lightning activity during a winter thunderstorm season around Hokuriku Coast was observed by SAFIR. The SAFIR system has been operating with three detection stations since 1991, and to improve the operation and detection efficiency an additional detection station was installed at the end of November, 1996. Thirty five thunderstorm days and 4427 flashes were recorded during last winter thunderstorm season, from December through late February, and the statistics on lightning activity are derived from the various aspects. The total number of cloud to ground flashes (CG) are 975 of which 42.3 percents are of positive polarity. The diurnal variation of lightning flashes are obtained, and its periodicity is revealed. The maximum of the lightning activity just before dawn is noticed, and perhaps in coincidence with the nighttime land-breeze convergence along the coast. The relation between the thunderstorm occurrence and the meteorological condition is investigated, and it is noticed the stronger monsoon accompanies the higher lightning activity. It is also noticed that both multiplicity and multi point strike-ness show the feature of log-normal distributions with their average 1.4 for multiplicity and 1.2 multi point strike-ness. Futhermore, this is the first paper that statistically discusses the multi point strike-ness.

Journal

Citations (2)*help

See more

References(17)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top