The spherical harmonic model, called EIGEN-2 , results from CHAMP tracking data from 2000-07-30 to 2001-12-31 (Sep00, Jan01 to Aug01 excluded)

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Reigber, C.; Balmino, G.; Schwintzer, P.; Biancale, R. (2004): EIGEN-2 - CHAMP Global Earth Gravity Field Spherical Harmonic Model from CHAMP tracking data CH-OG-4-EGM+M-00-07-30-01-12-31-001.1. GeoForschungsZentrum Potsdam.