A comparison of different source location methods for ELF transients by using the parent lightning discharges with known positions (アンテナ・伝播)

A comparison of different source location methods for ELF transients by using the parent lightning discharges with known positions (アンテナ・伝播)
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使用已知位置(天线/传播)的母闪电放电来比较 ELF 瞬变的不同源定位方法

DOI:
10.1029/2009ja014992
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发表时间:
2010
期刊:
--
影响因子:
--
通讯作者:
M. Hayakawa
M. Hayakawa
中科院分区:
--
文献类型:
--
作者:
Y. Hobara;Takashi Nakamura;M. Hayakawa

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[1] 迄今为止,为了定位 ELF 瞬变,已经提出了不同类型的测向方法(方位角和距离确定)。至于方位角的确定,我们使用了利萨如法、测角仪法和坡印廷矢量法,发现两者差别不大。最大的问题是距离(或源到观察者的距离)估计,这主要基于波阻抗的使用。利用欧洲精灵活动中母闪电放电的已知位置,我们比较了不同的方法((1)测量波阻抗和理论波阻抗之间在较宽频率范围内的互相关,(2)在观测波阻抗中使用峰值频率,(3)Jones和Kemp方法(在波阻抗频谱中使用最大值和最小值),(4)在波阻抗变化中使用振荡频率),发现最好的方法是使用Jones和Kemp方法分析的 11 个事件中,有 9 个具有足够信噪比的事件的误差为 0.33 Mm。这是基于 FFT 分析的。然而,对于其余两个时间间隔较小的事件,我们尝试使用小波分析,这显着改善了范围确定。最后,我们建议结合使用 Jones 和 Kemp 方法和小波分析来定位 ELF 瞬态。
[1] Different kinds of direction finding methods (azimuth and range determinations) 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, which are found to be not so much different. The biggest problem is the range (or source-to-observer distance) estimation, which is principally based on the use of wave impedance. By using the known positions of parent lightning discharges during the European sprite campaign, 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), and it is found that the best one is the use of Jones and Kemp method 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.
日本 Moshiri 的新 ELF 观测系统以及对所获得数据的评估
DOI: --
发表时间: 2005
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影响因子: --
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DOI: --
发表时间: 2005
期刊: Radio Sci. Vol.40,RS2002
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发表时间: 2007-04
期刊: Radio Science
影响因子: 1.6
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