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Observing, Modeling, and Interpreting Magnetic Fields of the Solid Earth

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Abstract

Many Earth system processes generate magnetic fields, either primary magnetic fields or in response to other magnetic fields. The largest of these magnetic fields is due to the dynamo in the Earth’s core, and can be approximated by a geocentric axial dipole that has decayed by nearly 10% during the last 150 years. This is an order of magnitude faster than its natural decay time, a reflection of the growth of patches of reverse flux at the core–mantle boundary. The velocity of the North magnetic pole reached some 40 km/yr in 2001. This velocity is the highest recorded so far in the last two centuries. The second largest magnetic field in the solid Earth is caused by induced and remanent magnetization within the crust. Controlled in part by the thermo-mechanical properties of the crust, these fields contain signatures of tectonic processes currently active, and those active in the distant past. Recent work has included an estimate of the surface heat flux under the Antarctic ice cap. In order to understand the recent changes in the Earth’s magnetic field, new high-quality measurements are needed to continue those being made by Ørsted (launched in 1999), CHAMP and the Ørsted-2 experiment onboard SAC-C (both launched in 2000). The present paper is motivated by the advent of space surveys of the geomagnetic field, and illustrates how our way of observing, modeling, and interpreting the Earth’s magnetic field has changed in recent years due to the new magnetic satellite measurements.

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  1. Mioara Mandea

    Present address: Geo Forschungs Zentrum Potsdam, Telegrafenberg, Potsdam, 14473, Germany

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  1. Institut de Physique du Globe de Paris, 4 Place Jussieu, 75005, Paris, France

    Mioara Mandea

  2. Raytheon ITSS at Planetary Geodynamics Lab, NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA

    Michael Purucker

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Mandea, M., Purucker, M. Observing, Modeling, and Interpreting Magnetic Fields of the Solid Earth. Surv Geophys 26, 415–459 (2005). https://doi.org/10.1007/s10712-005-3857-x

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