Candidate models for the IGRF-11th generation making use of extrapolated observatory data

Aude Chambodut (1) , Benoît Langlais (2) , Michel Menvielle (3) , Erwan Thébault (4) , Arnaud Chulliat (4) , Gauthier Hulot (4)

1 IPGS - Institut de physique du globe de Strasbourg
2 LPGN - Laboratoire de Planétologie et Géodynamique de Nantes [UMR 6112]
3 HELIOS - LATMOS
4 IPGP - Institut de Physique du Globe de Paris

Three candidate models are produced in response to the call for IGRF-11 models. A main field model around epoch 2005.0 is based on one year of ørsted and CHAMP measurements, and is proposed for the definitive model for epoch 2005.0. A main field model around epoch 2009.5, based on two months of CHAMP measurements and extrapolated to 2010.0, is proposed as a main field model for epoch 2010.0. A secular variation model valid for 2010.0-2015.0, based on the extrapolation through exponential smoothing of observatory monthly mean values, is proposed as a predictive secular variation model. Comparison of similar extrapolations made for previous IGRF generations with actual observations are presented and discussed.

Mots clés: Magnetic field; Main field; Secular variation; Modeling; IGRF; Time extrapolation; main field; secular variation; modeling; time extrapolation

Domaines: Sciences de la Terre

Aude Chambodut, Benoît Langlais, Michel Menvielle, Erwan Thébault, Arnaud Chulliat, et al.. Candidate models for the IGRF-11th generation making use of extrapolated observatory data. Earth Planets and Space, 2010, 62 (10), pp.745-751. ⟨10.5047/eps.2010.06.006⟩. ⟨hal-00558301⟩