A model of the secular change of the geomagnetic field for Antarctica

• Main Authors: Torta, J. M., De Santis, A., Chiappini, M., von Frese, R. R. B.
• Other Authors: Torta, J. M.; Observatori de l’Ebre, CSIC, 43520 Roquetes, Tarragona, Spain, De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, von Frese, R. R. B.; Department of Geological Sciences, and Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, USA, Observatori de l’Ebre, CSIC, 43520 Roquetes, Tarragona, Spain, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Department of Geological Sciences, and Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, USA
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2002
• Subjects: Antarctica; Spherical cap harmonic analysis; Magnetic surveys; Magnetic mapping; Geomagnetic secular variation; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous; Antarctic; The Antarctic; Antarc*
• Online Access: http://hdl.handle.net/2122/3899

An improved model of geomagnetic secular change for the Antarctic was developed using observatory annual mean values measured in Antarctica during the last 40 years. Spherical cap harmonic analysis (SCHA) with a power series time dependence was used to model spatial and temporal variations of main field differences at spatial wavelengths from 3000 to 13,000 km. The model was designed to facilitate merging satellite, airborne, marine and terrestrial magnetic data sets recorded at very different epochs in the Antarctic where significant annual geomagnetic changes have occurred. It improves the fit to observatory data by up to about 50% relative to the International Geomagnetic Reference Field. Published 179-187 JCR Journal reserved