First scalar magnetic anomaly map from CHAMP satellite data indicates weak lithospheric field -: art. no. 1702

被引：78

作者：

Maus, S ^{[1
]}

Rother, M ^{[1
]}

Holme, R ^{[1
]}

Lühr, H ^{[1
]}

Olsen, N ^{[1
]}

Haak, V ^{[1
]}

机构：

[1] Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2002年 / 29卷 / 14期

关键词：

Satellites;

D O I：

10.1029/2001GL013685

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

[1] Satellite magnetic anomaly maps derived by different techniques from Magsat/POGO data vary by more than a factor of 2 in the deduced strength of the lithospheric magnetic field. Here, we present a first anomaly map from new CHAMP scalar magnetic field data. After subtracting a recent Orsted main and external field model, we remove remaining unmodeled large-scale external contributions from 120 track segments by subtracting a best-fitting uniform field. In order to preserve N/S trending features, the data are not filtered along-track. Direct integration of the spherically gridded data yields the final degree 14-65 spherical harmonic expansion of the total intensity anomaly at the mean satellite altitude of 438 km. Apart from enhanced long wavelength features and a smoother general appearance, our initial map is strikingly similar to one of the lower strength Magsat/POGO maps.

引用

页数：4

共 10 条

[1] SCALAR MAGNETIC ANOMALY MAPS OF EARTH DERIVED FROM POGO AND MAGSAT DATA [J].