Slow tail: Difference between revisions
From Glossary of Meteorology
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<div class="definition"><div class="short_definition">The [[extremely low frequency]] (ELF) component of some [[sferics]] that lags the initial [[very low frequency]] (VLF) arrival because of the lower [[phase velocity]] at low frequencies.</div><br/> <div class="paragraph">The cause of the slow tail is still controversial. One explanation attributes it to the [[continuing current]]. The [[lightning]] radiation arrives after the initiating ground [[stroke]] because 1) it has components below about 3 kHz in frequencies (necessary for the propagation in the earth–ionosphere [[waveguide]] cavity), and 2) it suffers [[dispersion]] as a result of the waveguide propagation that broadens the original waveguide impulse, making it look like a tail.</div><br/> </div><div class="reference">Wait, J. R. 1960. On the theory of the slow-tail portion of atmospheric waveforms. J. Geophys. Res.. 65. 1939. </div><br/> | <div class="definition"><div class="short_definition">The [[extremely low frequency]] (ELF) component of some [[sferics]] that lags the initial [[very low frequency]] (VLF) arrival because of the lower [[phase velocity]] at low frequencies.</div><br/> <div class="paragraph">The cause of the slow tail is still controversial. One explanation attributes it to the [[continuing current|continuing current]]. The [[lightning]] radiation arrives after the initiating ground [[stroke]] because 1) it has components below about 3 kHz in frequencies (necessary for the propagation in the earth–ionosphere [[waveguide]] cavity), and 2) it suffers [[dispersion]] as a result of the waveguide propagation that broadens the original waveguide impulse, making it look like a tail.</div><br/> </div><div class="reference">Wait, J. R. 1960. On the theory of the slow-tail portion of atmospheric waveforms. J. Geophys. Res.. 65. 1939. </div><br/> | ||
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Latest revision as of 16:54, 25 April 2012
slow tail
The extremely low frequency (ELF) component of some sferics that lags the initial very low frequency (VLF) arrival because of the lower phase velocity at low frequencies.
The cause of the slow tail is still controversial. One explanation attributes it to the continuing current. The lightning radiation arrives after the initiating ground stroke because 1) it has components below about 3 kHz in frequencies (necessary for the propagation in the earth–ionosphere waveguide cavity), and 2) it suffers dispersion as a result of the waveguide propagation that broadens the original waveguide impulse, making it look like a tail.
Wait, J. R. 1960. On the theory of the slow-tail portion of atmospheric waveforms. J. Geophys. Res.. 65. 1939.
