Analysis of Q burst waveforms
Article first published online: 27 JAN 2007
Copyright 2007 by the American Geophysical Union.
Volume 42, Issue 2, April 2007
How to Cite
2007), Analysis of Q burst waveforms, Radio Sci., 42, RS2S18, doi:10.1029/2006RS003493., and (
- Issue published online: 27 JAN 2007
- Article first published online: 27 JAN 2007
- Manuscript Accepted: 30 AUG 2006
- Manuscript Revised: 7 JUN 2006
- Manuscript Received: 1 MAR 2006
- Q burst;
- Schumann resonance;
 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.