| Project/Area Number |
15403011
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Tohoku University |
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Principal Investigator |
TAKAHASHI Yukihiro Tohoku University, Graduate School of Science, Lecturer, 大学院・理学研究科, 講師 (50236329)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUNISHI Hiroshi Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (90099937)
MURATA Isao Tohoku University, Graduate School of Environmental Studies, Associate Professor, 大学院・環境科学研究科, 助教授 (00291245)
FUJIWARA Hitoshi Tohoku University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (50298741)
MAKITA Kazuo Tohoku University, Graduate School of Technology, Professor, 工学部, 教授 (40129945)
TAGUCHI Makoto National Institute of Polar Research, Associate Professor, 南極圏環境モニタリング研究センター, 助教授 (70236404)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2005: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2003: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | lightning / sprite / elves / middle atmosphere / upper atmosphere / ionosphere / magnetosphere / global / ELF / ネットワーク / 衛星観測 / 大気化学 / 北欧観測 / 人工衛星 / スウェーデン / 光学観測 / ELF観測 / 地球規模 / 北欧 / ブラジル / グローバル観測 |
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| Research Abstract |
In this research we have carried out optical and radio wave observations of lightning- induced TLEs (transient luminous events) in the middle and upper atmosphere, including sprites and elves, under international collaboration in order to clarify the generation mechanisms of TLEs and to understand their global effects both in electromagnetic and chemical point of view.
1. Sensor installation and steady observation in Scandinavia
We visited ESRANGE observatory in Kiruna, Sweden in 15 FSY and carried out maintenance/ of CCD camera, installation of ELF and VLF receivers. In 16 and 17 FSY, we visited there again and carried out the maintenance and adjustments. The continuous data acquisition have been carried out up to now successfuly.
2. Extension and steady operation of world wide ELF network
In addition to the ELF systems both at Syowa, Antarctica and Onagawa, Japan, we installed 2 more systems at Kiruna (FSY 15) and at Santa Cruz, California, USA (FSY 17). The system consisting of 4 stations is quite unique and the most useful network for lightning detection in estimating charge moment of lightning.
3. Optical measurements of TLEs by FORMOSAT-2/ISUAL and data analysis
Taiwanese satellite FORMOSAT-2 was launched successfully on 20 May, FSY of 16. FORMOSAT-2 carries 3 sprites/lightning optical equipments and its health is in good condition since the start of observation. The analysis shows the first global distribution of TLEs (sprites, elves) and absolute electron energy in TLE for the first time.
4. Estimation of chemical effects of TLEs and lightning based on computer simulation
We carried out the computer simulations to examine the physical mechanisms and to estimate the chemical effects on the ambient atmosphere. In addition, we visited University of Bremen, Germany and discussed about comparison between the chemical measurement with satellite and ELF network data.
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