Secular change in the geomagnetic field in West Africa for thirty years: Comparison with fourth generation IGRF models.
نویسندگان
چکیده
منابع مشابه
Evaluation of candidate geomagnetic field models for the 10th generation of IGRF
The recent satellite magnetic missions, combined with high quality ground observatory measurements, have provided excellent data for main field modelling. Four different groups submitted seven main-field and eight secular-variation candidate models for IGRF-10. These candidate models were evaluated using several different strategies. Comparing models with independent data was found to be diffic...
متن کاملEvaluation of candidate geomagnetic field models for IGRF - 11
1 Earth and Planetary Magnetism Group, Institut für Geophysik, Sonneggstrasse 5, ETH Zürich, CH-8092, Switzerland. 2NOAA/NGDC and CIRES, University of Colorado, U.S.A. 3British Geological Survey, Murchison House, West Mains Road, Edinburgh, EH9 3LA, U.K. 4Helmholtz Centre Potsdam, GFZ German Research centre for Geosciences, Telegrafenberg, 14473, Germany. 5School of Chemistry, University of New...
متن کاملEvaluation of candidate geomagnetic field models for the 10 generation of IGRF
The recent satellite magnetic missions, combined with high quality ground observatory measurements, have provided excellent data for main field modelling. Four different groups submitted seven main-field and eight secular-variation candidate models for IGRF-10. These candidate models were evaluated using several different strategies. Comparing models with independent data was found to be diffic...
متن کاملStochastic forecasting of the geomagnetic field from the COV-OBS.x1 geomagnetic field model, and candidate models for IGRF-12
We present the geomagnetic field model COV-OBS.x1, covering 1840 to 2020, from which have been derived candidate models for the IGRF-12. Towards the most recent epochs, it is primarily constrained by first differences of observatory annual means and measurements from the Oersted, Champ, and Swarm satellite missions. Stochastic information derived from the temporal spectra of geomagnetic series ...
متن کاملGeomagnetic field variations at dip equatorial latitudes of West Africa
A comprehensive study of geomagnetic field variations has been carried out at the dip equatorial latitudes of West Africa. The data obtained during the 1993 French participation in the International Equatorial Electrojet Year experiment in Africa was used for the analysis. Only the quiet condition was examined. Variation in the three geomagnetic field elements (H, D, and Z) showed more variabil...
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1987
ISSN: 0022-1392
DOI: 10.5636/jgg.39.699