1995 Fiscal Year Final Research Report Summary
The Maritime Continent Thunderstorm Experiment
| Project/Area Number |
07041109
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | Kyoto Bunkyo University (1996)
OSAKA UNIVERSITY (1995) |
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Principal Investigator |
KAWASAKI Zen-ichiro Faculty of Engineering, Osaka University Associate Professor, 工学部, 助教授 (60126852)
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| Co-Investigator(Kenkyū-buntansha) |
MAZUR Vlad NOAA, National Severe Storms Laboratory Senior Investigator, 国立雷嵐研究所, 主任研究員
WILLIAMS E. Massachusetts Institute of Technology Professor, 教授
FUNAKI Tsuyoshi Faculty of Engineering, Osaka University Assistant, 工学部, 助手 (20263220)
王 道洪 岐阜大学, 工学部, 助手 (20273120)
WANG Daohong Faculty of Engineering, Gifu University Assistant
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| Project Period (FY) |
1994 – 1996
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| Keywords | maritime continent thunderstorm / interferometer / lightning channel / imaging / capacitive antenna / electric field change / leader / return strokes |
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| Research Abstract |
The Maritime Continent Thunderstorm Experiment was conducted from Nov. 11, 1995 through Dec. 11, 1995 as a cooperative project among Japan, U.S.A.and Australia. The thunderstorm activity so called Hector was observed by Doppler Radar, Wind Profiler, Microwave radio meter, Meteorological Radar, and UHF Interferometer. Osaka University was assigned to measure Electric Field changes due to lightning discharges. It was also assigned to perform the imaging of lightning channel by operating the UHF Interferometer. The capacitive antenna system for Electric Field changes and the Interferometer were originally intended to trigger by detecting the luminosity due to lightning discharges. We found the efficiency of data acquisition was relatively low, because of the solar luminosity during the thunderstorm activity. It was brighter than we expected due to the altitude of the cloud base. We redesigned the whole triggering system and the capacitive antenna system and Interferometer were triggered b
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y detecting the UHF radiatin caused by discharges. We operated our systems for 16 days and captured 200 data sets. They said the most active Hector caused more than 50 flashes per second. Since our systemsown the 20-second dead time for captured data recording, we could not confirm the real activity rate of lightning flashes during Hector. The following is the scenario for Hector activity which we obtained through this experiment. Normally we recognized the comulonimbus generation before noon, and it moved to the north with growing. The diameter of Hector occasionally exceeded 20 km and the lightning activity continued about 2 hours. The ratio of the cloud-to-ground flashes against all flashes is apparently 0.1 and it is concident with the former statistics. The final conclusion will be obtained through the workshop which will be held after the data analysis, and we show the tentative results which we can reach by the uhf imaging of lightning channel. We recorded several multiple strokes and get the information of the stepped leader progression and dart leader's one. The tentative results will be presented in the related conference. Less
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