1887
Volume 24, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Regional models of the geomagnetic field offer higher resolution than can be achieved with global models. However, for any particular application, the choice of geomagnetic reference field, global or regional, depends on the accuracy requirements and whether information at crustal wavelengths is needed. The most stringent demands of directional drilling may be beyond the accuracy limits of even the best regional models, whereas a good global model may be adequate to meet many navigational requirements. Accurate regional data, particularly estimates of secular variation from observatories and repeat stations, provide the foundations for global as well as regional field models, and need to be made available to the world community.

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1993-06-01
2026-01-22

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References

  1. Barton C.E. (1988). ‘Global and regional geomagnetic reference fields’. Bull. Aust. Soc. Explor. Geophys.19, 412–416.
  2. Barton C.E. (1991). ‘AGRF — revision of the Australian Geomagnetic Reference Field’. Preview, Aust. Soc. Exploration Geophysicists Newsletter, No. 35, 8.
  3. Barton C.E., Johnson, B.D. and Arnott, F.W. (1988). ‘Geomagnetic Reference Fields: base-level and diurnal corrections to aeromagnetic data’. Bull. Aust. Soc. Explor. Geophys.19, 447–452.
  4. Barton, C.E., Winch, D.E., McEwin, A.J., Hitchman, A.P. and Hopgood, P.A. (1992). ‘Evaluation over Australia of candidate models for IGRF90’. J. Geomag. Geoelectr.44, 843–854.
  5. Courtillot, V. and Le Mouёl, J.-L. (1984). ‘Geomagnetic secular variation impulses’. Nature 311, 709–716.
  6. Dooley, J.C. and McGregor, P.M. (1982). ‘Correlative geophysical data in the Australian region for use in the MAGSAT project’. Bull. Aust. Soc. Explor. Geophys.13, 63–67.
  7. Hopgood, P.A. (1993). ‘Australian magnetic observatories’. This volume.
  8. IAGA Division V, Working Group 8, R. A. Langel, chairman (1991). ‘International Geomagnetic Reference Field, 1991 revision’. J. Geomag., Geoelectr43, 1007–1012 (also EOS Trans. Am. Geophys. Un.73, 182, 1992; Geophys. J. Int. 108: 945–946, 1992.
  9. Langel, R.A. (1992). ‘International Geomagnetic Reference Field, 1991 revision: International Association of Geomagnetism and Aeronomy (IAGA) Division V, Working Group 8: analysis of the main field and secular variation’. Phys. Earth. Planet. Int. 70,1-6.
  10. Malin, S.R.C. (1985). ‘On the unpredictability of geomagnetic secular variation’. Phys. Earth Planet. Int.39, 293–296.
  11. McEwin, A.J. (1993). ‘The repeat station network and estimation of secular variation in the Australian region’. This volume.
  12. McFadden P.L. and Barton, C.E. (1992). ‘MAGSHOW: a visual interface for the Australian Geomagnetic Reference Field’. Aus. Geo News, Australian Geological Survey Organisation, Canberra, No.13, 4.
  13. Quinn, J.M., Coleman, R.J., Peck, M.R. and Lauber, S.E. (1991). ‘The joint US/UK 1990 epoch World Magnetic Model’. U.S. Naval Oceanographic Office Technical Report TR 304, pp. 213.
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  • Article Type: Research Article
Keyword(s): compass navigation; geomagnetic reference fields; IGRF; magnetic direction-finding; magnetic surveys

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