HR: 14:35h
AN: GP53A-03 INVITED     [Abstracts]
TI: What can we Expect From Present Geomagnetic Field Studies in the Next Years?
AU: * Gaya-Pique, L R
EM: gaya@ipgp.jussieu.fr
AF: Equipe de Géomagnétisme Institut de Physique du Globe de Paris - CNRS, 2 place Jussieu, Tour 14, Paris, 75005, France
AB: The International Decade of Geopotential Field Research, firstly proposed by a resolution of the International Association of Geomagnetism and Aeronomy in 1997, is changing our approaches towards the study of the present geomagnetic field. In a few years, Swarm satellites will complete the cycle of missions started few years ago with Orsted, Champ, and SAC-C with the objective of undertaking high-resolution mapping of the magnetic field from space. The new global models will theoretically be able to go up to degree 130 and beyond, filling the traditional gap in the power spectrum between near-surface and satellite data. Moreover, the availability of satellite data for a long period has allowed the development of preliminary models of the secular variation of the magnetic field using only satellite data. Traditional modeling of the magnetic field using spherical harmonics expansion is now used alongside other techniques such as wavelet analysis and regional techniques like R- SCHA. This latter technique, due to its capacity to represent very short wavelengths, will have a great importance in the exploitation of the World Digital Magnetic Anomaly Map and in all the geological implications that can be derived from it. In addition, the use of a Geographical Information System approach has been shown to be a fundamental tool for the compilation of this magnetic anomaly map of the world. As well as newly obtained data, the reanalysis of old surveys and compilations with new approaches and techniques is giving interesting results, like the recent discovery of ultrafast oceanic spreading in some areas of the Mediterranean Sea. Scientists are also questioning the role of the magnetic field on climate change, and geophysical prospecting techniques will be employed by organizations like UN to unveil hidden nuclear explosions. In this talk I will try to give an overview of the major issues that have happened in recent years, on these and other topics, as an approach to what can be expected in the near future.
DE: 1517 Magnetic anomalies: modeling and interpretation
DE: 1532 Reference fields: regional, global
DE: 1541 Satellite magnetics: main field, crustal field, external field
DE: 1599 General or miscellaneous
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly