Comment on 'Cloud-to-stratosphere lightning discharges - A radio emission model' by W. M. Farrell and M. D. Desch

Details Comment on 'Cloud-to-stratosphere lightning discharges - A radio emission model' by W. M. Farrell and M. D. Desch Comment on 'Cloud-to-stratosphere lightning discharges - A radio emission model' by W. M. Farrell and M. D. Desch

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..761h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 8, p. 761, 762; Authors' Reply, p. 763, 764.

Physics

3

Atmospheric Conductivity, Clouds (Meteorology), Earth Ionosphere, Electric Fields, Lightning, Stratosphere, Boundary Conditions, Dipole Moments, Extremely Low Radio Frequencies, Mathematical Models, Monopoles, Waveguides

Scientific paper

The calculations by Farrell and Desch (1992) of electric field spectra expected from cloud-to-stratosphere lightning are commented on. They use the first and second time derivatives of a dipole moment to calculate the distant electric field spectra of the lightning, which maximizes in the ELF/ULF region. It is argued that this 'free-space' formulation is not accurate, and that a more correct calculation will produce similar spectral amplitudes with far smaller lightning currents. Also, the direct or capacitive coupling of the lightning currents to the TEM mode of the earth-ionosphere waveguide is much more efficient at ELF/ULF than excitation by a 'short dipole'. The original authors reply that for wave emissions greater than 1 Hz observed 200 km from the source, the inclusion of waveguide effects yields comparable or smaller values than those originally modeled by Farrell and Desch (1992).

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