Workshop Report and Discussion Paper: Geomagnetic Reference Fields; Base-Level and Diurnal Corrections to Aeromagnetic Data

C. E. Barton; B. D. Johnson; F. W. Arnott

doi:10.1071/EG988447

ISSN: 0812-3985
E-ISSN: 1834-7533

Workshop Report and Discussion Paper: Geomagnetic Reference Fields; Base-Level and Diurnal Corrections to Aeromagnetic Data
Authors C. E. Barton^a, B. D. Johnson^a and F. W. Arnott^b
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^a Geomagnetism Section Bureau of Mineral Resources, GPO Box 378 Canberra, , ACT, 2601, Australia ^b Stockdale Prospecting Ltd, 60 Wilson Street, South Yarra, , VIC, 3141, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 19, Issue 3, Jun 1988, p. 447 - 452
DOI: https://doi.org/10.1071/EG988447
- Received: 10 Jun 1988
- Published online: 01 Jun 1988

Abstract

Geomagnetic reference fields and corrections to aeromagnetic data were the subjects of a discussion workshop held in Canberra on 1st December 1987. The proceedings of the workshop that are most relevant to aeromagnetic exploration in Australia are summarized in this article and supplemented with our additional comments. An accompanying paper (Barton, this issue) provides a more detailed exposition on the derivation and applications of global and regional geomagnetic reference fields.

Initial discussions centred on recent developments in global and regional (Australian) modelling of the geomagnetic field, and applications and limitations on the use of available models. Attention then turned to the aeromagnetic ‘diurnal’ correction problem, the use of base-station and tie-line crossovers for making ‘diurnal’ corrections, continental and oceanic induction effects, the relative merits of magnetic gradiometer surveys, and ramifications of the modern trend towards the use of rapid sampling (≤ 10 second) and high sensitivity (subnanotesla) survey techniques. Investigations into the spatial variability of magnetic field fluctuations using magnetometer arrays are needed both on a regional scale and on a local scale. The proposed Australia-wide array of geomagnetic stations (AWAGS) experiment is an example of the former. New methods of presenting the results of such investigations are also needed, for example in the form of a set of ‘base-station reliability’ maps of the region.

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References

Anthony, S. J. (1983) — ‘Coherence study of geomagnetic fluctuations in frequency range 0.04–0.6 Hz between remote land sites’, unpublished thesis, Naval Postgraduate School, Monterey, California.
Barton, C. E. (1988) — ‘The role of global and regional geomagnetic reference fields’, Exploration Geophysics19, 401–416.
Bennett, D. J. and Lilley, F. E. M. (1974) — ‘Electrical conductivity structure in the south-east Australian region’, Geophys. J. Ft. Astr. Soc.37, 191–206.
Chamalaun, F. H. (1975) — ‘An Australia-wide array of geomagnetic stations’, Geol. Soc. Australia Specialist Group on Solid Earth Geophysics Newsletter, No. 2, December 1985, 7–9.
Chamalaun, F. H. and Walker, R. (1974) — ‘A microprocessor based digital fluxgate magnetometer for geomagnetic deep sounding studies’, J. Geomag. Geoelectr. 34, 491–507.
IAGA Division I Working Group 1 (1987) — ‘International Geomagnetic Reference Field revision 1987’, J. Geomag. Geoelectr. 39, 773–779.
IAGA Division I Working Group 1 (1988) — ‘International Geomagnetic Reference Field revision 1987’, Geophysics53, 576–578.
Lilley, F. E. M. and Bennett, D. J. (1973) — ‘Micropulsations recorded by an array of magnetometers’, J. Geophys. Res. 78,1603–1607.
Parkinson, W. D. (1962) — ‘The influence of continents and oceans on geomagnetic variations’, Geophys. J. Roy. Astr. Soc. 6, 441–449.
Parkinson, W. D. and Jones, F. W. (1979) — ‘The geomagnetic coast effect’, Rev. Geophys, Space Phys. 17, 1999–2015.
Parkinson, W. D. (1983) — ‘Introduction to Geomagnetism’, Scottish Academic Press, Edinburgh, pp.433.

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Article Type: Research Article

Keyword(s): aeromagnetic; AGRF; base-station; diurnal correction; geomagnetic induction; geomagnetic variations; IGRF; magnetometer array; reference field

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Workshop Report and Discussion Paper: Geomagnetic Reference Fields; Base-Level and Diurnal Corrections to Aeromagnetic Data

Abstract

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