Analysis of Q burst waveforms
Analysis of Q burst waveforms
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Q突发波形分析
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Komatsu
中科院分区：
文献类型：
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作者：
T. Ogawa;M. Komatsu
2003-2004年期间，在高知县（北纬33.3°，东经133.4°）天气晴朗时，用球形天线观测到了ELF到VLF的电场变化。获得了大约 376 个 Q 爆发，本研究分析了其中的 7 个例子。将Q突发的连续频谱与1.0 Hz至11 kHz的背景噪声进行比较，发现在1至300 Hz的频率范围内Q突发优于背景。接近基模频率时，剩余量为 20 dB（幅度）。 Q 突发波形初始部分中发现的“W”型变化被解释为引起雷击的直射波和反足波的组合电磁波形。根据两个波之间的时间间隔，源-接收器距离估计最远为 19 Mm。在 Q 脉冲串中激发舒曼共振的脉冲被清楚地识别。
The electric field changes in ELF to VLF were observed with a ball antenna in fair weather at Kochi (latitude 33.3°N, longitude 133.4°E) during 2003–2004. Some 376 Q bursts were obtained, seven examples of which are analyzed in the present study. The continuous frequency spectra of the Q bursts and the background noises from 1.0 Hz to 11 kHz are compared, and it was found that the Q bursts prevail over the background in the frequency range from 1 to 300 Hz. The surplus is 20 dB (in amplitude) near the fundamental mode frequency. The “W”‐type changes found in the initial portion of the Q burst waveforms are interpreted as the combined electromagnetic waveform of direct and antipodal waves from the causative lightning strokes. From the time intervals between the two waves, the source‐receiver distances are estimated as far as 19 Mm. The pulses to excite the Schumann resonances in the Q bursts are clearly identified.