Sferic signals for lightning sourced electromagnetic surveys

Lachlan Hennessy; James Macnae

doi:10.1071/ASEG2018abT4_2F

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa Sferic signals for lightning sourced electromagnetic surveys
Authors Lachlan Hennessy^a and James Macnae^b
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^a RMIT University, [email protected] ^b RMIT University
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2018abT4_2F
- Published online: 01 Dec 2018

Abstract

Lightning strikes generate electromagnetic (EM) waves, known as sferics, which are used in passive Audio-Frequency Magnetotelluric (AMT) and Geomagnetic depth soundings (GDS). Global lightning networks detect sferics and catalogue the time and location of up to four million lightning strikes per day. In this research, we use lightning network data and model earth-ionosphere waveguide propagation to predict time of arrival, azimuth, and amplitude for each known sferic in our time series EM data.

Since conductors effectively rotate electromagnetic fields, we can in principle infer the location and geometry of local and regional structures by calculating the rotation of measured data from their predicted arrival azimuths.

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2026-01-19

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References

Bannister, P. R., 1967, Quasi-static fields of dipole antennas located above the earth’s surface: Radio Science 2 (9), 10931103.
Chave, A. D. and A. G. Jones, 2012, The magnetotelluric method: Theory and practice: Cambridge University Press.
Garcia, X. and A. G. Jones 2002, Atmospheric sources for audio-magnetotelluric (AMT) sounding: Geophysics 67 (2), 448458.
Hennessy, L. and J. Macnae, 2017, Predicting lightning sourced electromagnetic fields: Exploration Geophysics, accepted 25 May 2017.
Nickolaenko, A., et al., 2010, Q-bursts: Natural ELF radio transients: Surveys in Geophysics 31 (4), 409-425.
Raiche, A., 2004, Practical 3D airborne EM inversion in complex terranes: ASEG Extended Abstracts 2004 (1), 1-4.
Said, R., et al., 2010, Long-range lightning geolocation using a VLF radio atmospheric waveform bank: Journal of Geophysical Research: Atmospheres 115.
Zonge, K. L. and L. J. Hughes 1991, Controlled source audio-frequency magnetotellurics. Electromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and B: Society of Exploration Geophysicists, 713-810.

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Article Type: Research Article

Keyword(s): Electromagnetics; Lightning; Magnetotellurics

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oa Sferic signals for lightning sourced electromagnetic surveys

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