| 講演名 | 2011/6/9 A comparison of different source location methods for ELF transients by using the parent lightning discharges with known positions , |
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| 抄録(英) | Different kinds of direction finding methods have been proposed so far in order to locate ELF transients. As for the azimuth determination, we have used the Lissajous method and goniometer and Poynting vector methods. The range (or source-to-observer distance) estimation, based on the use of wave impedance, by using the known positions of parent lightning discharges during the European sprite campaign. In this case, we have compared different methods ((1) cross-correlation over a wide frequency range between the measured and theoretical wave impedances, (2) the use of peak frequency in the observed wave impedance, (3) Jones and Kemp method (the use of maxima and minima in the frequency spectrum of wave impedance), (4) the use of oscillation frequency in the wave impedance variation). As a result we found that the Jones and Kemp method has produced the best results with an error of 0.33 Mm for the nine events with sufficient S/N ratio from the analyzed 11 events. This has been based on the FFT analysis. However, for the remaining two events with small time separation, we have tried the use of wavelet analysis, which improved the range determination significantly. Finally, we recommend a combined use of Jones and Kemp method and wavelet analysis for locating ELF transients. |
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| キーワード(英) | ELF transient / Q-burst / direction finding / lightning / sprites |
| 資料番号 | A・P2011-21 |
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| 研究会情報 | |
| 研究会 | AP |
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| 開催期間 | 2011/6/9(から1日開催) |
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| 申込み研究会 | Antennas and Propagation (A・P) |
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| 本文の言語 | ENG |
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| タイトル（英） | A comparison of different source location methods for ELF transients by using the parent lightning discharges with known positions |
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| キーワード(1)（和/英） | / ELF transient |
| 第 1 著者 氏名（和/英） | / Yasuhide HOBARA |
| 第 1 著者 所属（和/英） | Department of Electronic Engineering, University of Electro-Communications |
| 発表年月日 | 2011/6/9 |
| 資料番号 | A・P2011-21 |
| 巻番号（vol） | vol.111 |
| 号番号（no） | 79 |
| ページ範囲 | pp.- |
| ページ数 | 5 |
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