EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements

Type de publication:

Journal Article

Source:

Geochemistry Geophysics Geosystems, Volume 10 (2009)

ISBN:

1525-2027

Numéro d'accès:

WOS:000268818100001

URL:

http://www.agu.org/pubs/crossref/2009/2009GC002471.shtml

Mots-clés:

UMR 7154 ; Géomagnétisme ; magnetic anomaly ; magnetic grid ; magnetic model

Résumé:

A global Earth Magnetic Anomaly Grid (EMAG2) has been compiled from satellite, ship, and airborne magnetic measurements. EMAG2 is a significant update of our previous candidate grid for the World Digital Magnetic Anomaly Map. The resolution has been improved from 3 arc min to 2 arc min, and the altitude has been reduced from 5 km to 4 km above the geoid. Additional grid and track line data have been included, both over land and the oceans. Wherever available, the original shipborne and airborne data were used instead of precompiled oceanic magnetic grids. Interpolation between sparse track lines in the oceans was improved by directional gridding and extrapolation, based on an oceanic crustal age model. The longest wavelengths (>330 km) were replaced with the latest CHAMP satellite magnetic field model MF6. EMAG2 is available at http://geomag.org/models/EMAG2 and for permanent archive at http://earthref.org/ cgi-bin/er.cgi?s=erda.cgi?n=970.