| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
The VHF broadband digital interferometer and the LF broadband receiver that have been used successfully for summer lightning, are upgraded to estimate charge regions and scale of lightning discharges in winter thunderstorms. A recording method of the VHF interferometer is changed from a trigger recording method to a continuous recording method. The new one visualizes details of recoil leaders that the current one has limitations to visualize, and estimates charge regions in thunderstorms. The LF receiver is suitable for an overview of horizontal lightning propagation. At the same time, it is not enough for visualizing details of lightning channel propagation. One of the reasons seems to be in frequency characteristic of the LF receiver. An antenna circuit in the LF receiver is improved and evaluated by test observations.
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