Special Issue: Swarm—The Earth’s Magnetic Field and Environment Explorers
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Modeling and analysis of solar wind generated contributions to the near-Earth magnetic field
Earth, Planets and Space volume 58, pages 451–461 (2006)
Abstract
Solar wind generated magnetic disturbances are currently one of the major obstacles for improving the accuracy in the determination of the magnetic field due to sources internal to the Earth. In the present study a global MHD model of solar wind magnetosphere interaction is used to obtain a physically consistent, divergence-free model of ionospheric, field-aligned and magnetospheric currents in a realistic magnetospheric geometry. The magnetic field near the Earth due to these currents is analyzed by estimating and comparing the contributions from the various parts of the system, with the aim of identifying the most important aspects of the solar wind disturbances in an internal field modeling context. The contribution from the distant magnetospheric currents is found to consist of two, mainly opposing, contributions from respectively the dayside magnetopause currents and the cross-tail current. At high latitudes the field-aligned component is of partidular interest in connection with internal field-modelling. In the altitude regime of 400–800 km (typical for low Earth orbit satellites) the ionospheric currents are found to contribute significantly to the disturbancance, and account for more than 90% of the field-aligned disturbance. The magnetic disturbance field from field-aligned currents (FACs) is basically transverse to the main field, and they therefore contribute with less than 2% to the disturbance in total field intensity. Inhomogeneity in ionospheric conductance is identified as the main cause of main-field disturbance in the field-aligned direction. These disturbances are associated with the ionospheric Pedersen currents, and may introduce systematic errors in internal field models.
References
Friis-Christensen, E., Y. Kamide, A. D. Richmond, and S. Matsushita, Interplanetary magnetic field control of high-latitude electric fields and currents determined from Greenland magnetometer data, J. Geophys. Res., 90, 1325–1338, 1985.
Fukushima, N., Generalized theorem for no ground magnetic effect of vertical currents connected with pedrsen currents in the uniform conductivity ionosphere, Rep. Ionos. Space Res. Jpn., 30, 35–40, 1976.
Hardy, D. A., M. S. Gussenhoven, and E. Holeman, A statistical model of auroral electron precipitation, J. Geophys. Res., 90, 4229–4248, 1985.
Hardy, D. A., M. S. Gussenhoven, and R. Raistrick, Statistical and functional representations of the pattern of auroral energy flux, number flux and conductivity, J. Geophys. Res., 92, 12,275–12,294, 1987.
Kelley, M. C., The Earth’s Ionosphere, Academic Press, New York, 1989.
Langel, R. A., The main field, in Geomagnetism, edited by J. A. Jacobs, vol. 1, pp. 249–512, Academic Press, London, 1987.
Moretto, T., S. Vennerstrøm, N. Olsen, L. Rastätter, and J. Raeder, Using global magnetospheric models for simulation and interpretation of Swarm external field measurements, Earth Planets Space, 58, this issue, 439–449, 2006.
Papitashvili, V., F. Christiansen, and T. Neubert, A new model of field-aligned current derived from high-precision satellite magnetic field data, Geophys. Res. Lett., 29, 10.1029/2001GL01,420, 2002.
Raeder, J., Global geospace modeling: Tutorial and review, in Space Plasma Simulations, edited by J. Buchner, C. T. Dunn, and M. Scholer, vol. 615 of Lecture Notes in Physics, Springer Verlag, Berlin, 2003.
Raeder, J., R. J. Walker, and M. Ashour-Abdalla, The structure of the distant geomagnetic tail during long periods of northward IMF, Geophys. Res. Lett., 22, 349, 1995.
Raeder, J., J. Berchem, and M. Ashour-Abdalla, The geospace environment modeling grand challenge: Results from a global geospace circulation model, J. Geophys. Res., 103, 14,787, 1998.
Sabaka, T. J., N. Olsen, and R. A. Langel, A comprehensive model of the quiet-time near-Earth magnetic field: Phase 3, Geophys. J. Int., 151, 32–68, 2002.
Sabaka, T. J., N. Olsen, and M. Purucker, Extending comprehensive models of the Earth’s magnetic field with Ørsted and CHAMP data, Geophys. J. Int., 159, 521–547, doi: 10.1111/j.1365-246X.2004.02,421.x, 2004.
Vennerstrom, S., T. Moretto, L. Ratstätter, and J. Raeder, Field-aligned currents during northward interplanetary magnetic field: Morphology and causes, J. Geophys. Res., 110, 10.1029/2004JA010,802, 2005.
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Vennerstrom, S., Moretto, T., Rastätter, L. et al. Modeling and analysis of solar wind generated contributions to the near-Earth magnetic field. Earth Planet Sp 58, 451–461 (2006). https://doi.org/10.1186/BF03351941
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DOI: https://doi.org/10.1186/BF03351941