Special Issue: Geomagnetic Field Modelling and IGRF 2000
- Open Access
Improving the modelling of the geomagnetic main-field: Isolating the average ionospheric field in satellite data
Earth, Planets and Space volume 52, pages 1199–1206 (2000)
Olsen’s method (Olsen, 1996) is applied to Magsat magnetic field data to deduce average quiet-time and active-time ionospheric current systems at middle to high North and South latitudes. Spot magnetic field values at ground level are calculated from the average models and are ‘ground-truthed’ against observatory data. The results suggest that synoptic ionospheric models from Magsat-quality satellite data may be helpful in reducing the contamination of the main-field by non-field-aligned ionospheric sources. We discuss how the technique may be applied to data from the Ørsted mission and the extent to which these ionospheric field models may therefore be useful in improved modelling of the geomagnetic main field.
Backus, G., Poloidal and toroidalfields in geomagnetic field modelling, Rev. Geophys., 24, 75–109, 1986.
Kamide, Y. and S. Matsushita, Simulation studies of ionospheric electric fields and currents in relation to field-aligned currents: 1. quiet periods, J. Geophys. Res., 84, 4083–4098, 1979a.
Kamide, Y. and S. Matsushita, Simulation studies of ionospheric electric fields and currents in relation to field-aligned currents: 2. substorms, J. Geophys. Res., 84, 4099–4115, 1979b.
Kamide, Y., A. D. Richmond, and S. Matsushita, Estimation of ionospheric electric fields, ionospheric currents, and field-aligned currents from ground magnetic records, J. Geophys. Res., 86, 801–813, 1981.
Kisabeth, J. L. and G. Rostoker, Modelling of three-dimensional current systems associated with magnetospheric substorms, Geophys. J. R. Astr. Soc., 49, 655–683, 1977.
Langel, R. A., The main field, in Geomagnetism, Vol. 1 Ch. 4, edited by J. A. Jacobs, pp. 249–512, Academic Press, London, 1987.
Langel, R. A. and R. H. Estes, Large-scale, near-earth magnetic fields from external sources and the corresponding induced internalfield, J. Geophys. Res., 90, 2487–2494, 1985a.
Langel, R. A. and R. H. Estes, The near-earth magnetic field at 1980 determined from MAGSAT data, J. Geophys. Res., 90, 2495–2510, 1985b.
Langel, R. A. and W. J. Hinze, The magnetic field of the earth’s lithosphere, Cambridge University Press, 1998.
Marquardt, D. W., Generalized inverses, ridge regression, biased linear estimation and non-linear estimation, Technometrics, 12, 591–612, 1970.
Olsen, N., A new tool for determining ionospheric currents from magnetic satellite data, Geophys. Res. Lett., 23, 3635–3638, 1996.
Quinn, J. M., R. J. Coleman, S. Macmillan, and D. R. Barraclough, The 1995 revision of the joint US/UK geomagnetic field models. II: Main Field, J. Geomag. Geoelectr., 49, 245–261, 1997.
Rich, F.J. and Y. Kamide, Convection electricfields and ionospheric currents derived from model field-aligned currents at high latitudes, J. Geophys. Res., 88, 271–281, 1983.
Thomson, A. W. P., S. Macmillan, and D. R. Barraclough, Geomagnetic main-field modelling with POGS satellite data, J. Geomag. Geoelectr., 49, 417–440, 1997.
Walker, J. K., V. Y. Semenov, and T. L. Hansen, Synoptic models of high latitude magnetic activity and equivalent ionospheric and induced currents, J. Atmos. Solar-Terr. Phys., 59, 1435–1452, 1997.
About this article
Cite this article
Thomson, A.W.P. Improving the modelling of the geomagnetic main-field: Isolating the average ionospheric field in satellite data. Earth Planet Sp 52, 1199–1206 (2000). https://doi.org/10.1186/BF03352352
- Satellite Data
- Auroral Zone
- Magnetic Local Time
- Ionospheric Model
- Auroral Oval