Abstract
Some of the most interesting features of the Earth’s magnetic field and of its time variations are displayed in polar areas, where the geomagnetic field dipole poles are located. Space time models of the geomagnetic field give a mathematical description that allows generally to undertake a common epoch time reduction of magnetic surveys and to extract magnetic anomaly maps after removing the main part of the geomagnetic field; in addition in polar regions geomagnetic field models allow to follow the location of the geomagnetic dip poles in their time wandering. In this work the development of a dedicated regional magnetic reference model for Antarctica (Antarctic Reference Model, ARM) is presented and compared to the well known IGRF (International Geomagnetic Reference Field) model and it is shown that the first is more appropriate to better study the behaviour of secular variation and its unusual characteristics as observed in Antarctica.
Moreover single and multi-station analyses have been applied to the longest available time series of geomagnetic data for Antarctica in order to investigate the most interesting behaviour of secular variation: the geomagnetic jerks. It was found that geomagnetic jerks are also detectable in Antarctica and that they show a peculiar space time structure.
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References
Alexandrescu M, Gibert D, Hulot G, Le Mouël, Saracco G (1996) Worldwide wavelet analysis of geomagnetic jerks. J Geophys Res 101:21975–21994
Bloxham J, Zatman S, Dumberry M (2002) The origin of geomagnetic jerks. Nature 420:65–68
De Michelis P, Cafarella L, Meloni A (2000) A global analysis of the 1991 geomagnetic jerk. Geophys J Internat 143:545–556
De Santis A, Torta JM, Gaya-Piqué LR (2002) The first Antarctic geomagnetic Reference Model (ARM). Geophys Res Letters 29(8):1129
Gaya-Piqué LR, De Santis A, Torta JM (2004) Use of Champ magnetic data to improve the Antarctic geomagnetic Reference Model. In: Schwintzer P, Wickert J (eds) Earth observation with Champ results from three years in orbit. Springer, Berlin Heidelberg New York, pp 317–322
Haines GV (1985) Spherical Cap Harmonic Analysis. J Geophys Res 90(3):2583–2591
Haines GV (1993) Modelling geomagnetic secular variation by mainfield differences. Geophys J Internat 114:490–500
Malin SRC, Hodder BM (1982) Was the 1970 geomagnetic jerk of internal or external origin? Nature 296:726–729
Mandea M, Macmillan S (2000) International Geomagnetic Reference Field — The eighth generation. Earth Planet Space 52:1119–1124
Mandea M, Bellanger E, Le Mouel JL (2000) A geomagnetic jerk for the end of the 20th century? Earth Planet Sci Letters 183:369–373
Torta JM, De Santis A, Chiappini M, von Frese R (2002) A model of the secular change of the Geomagnetic Field for Antarctica. Tectonophysics 347:179–187
Waddington R, Gubbins D, Barber N (1995) Geomagnetic field analysis — V. Determining steady core-surface flows directly from geomagnetic observations. Geophys J Internat 122:326–350
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© 2006 Springer-Verlag Berlin Heidelberg
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Meloni, A., Gaya-Piqué, L.R., De Michelis, P., De Santis, A. (2006). Some Recent Characteristics of Geomagnetic Secular Variations in Antarctica. In: Fütterer, D.K., Damaske, D., Kleinschmidt, G., Miller, H., Tessensohn, F. (eds) Antarctica. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-32934-X_47
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DOI: https://doi.org/10.1007/3-540-32934-X_47
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-30673-3
Online ISBN: 978-3-540-32934-3
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