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Detailed Reference Information |
Ogawa, T. and Komatsu, M. (2007). Analysis of Q burst waveforms. Radio Science 42: doi: 10.1029/2006RS003493. issn: 0048-6604. |
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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. |
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Abstract |
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Keywords
Atmospheric Processes, Atmospheric electricity, Atmospheric Processes, Lightning, Radio Science, Radio wave propagation |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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