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Utility of Satellite Magnetic Observations for Estimating Near-Surface Magnetic AnomaliesRegional to continental scale magnetic anomaly maps are becoming increasingly available from airborne, shipborne, and terrestrial surveys. Satellite data are commonly considered to fill the coverage gaps in regional compilations of these near-surface surveys. For the near-surface Antarctic magnetic anomaly map being produced by the Antarctic Digital Magnetic Anomaly Project (ADMAP), we show that near-surface magnetic anomaly estimation is greatly enhanced by the joint inversion of the near-surface data with the satellite observations relative to the conventional technique such as minimum curvature. Orsted observations are especially advantageous relative to the Magsat data that have order-of-magnitude greater measurement errors, albeit at much lower orbital altitudes. CHAMP is observing the geomagnetic field with the same measurement accuracy as the Orsted mission, but at the lower orbital altitudes covered by Magsat. Hence, additional significant improvement in predicting near-surface magnetic anomalies can result as these CHAMP data are available. Our analysis also suggests that considerable new insights on the magnetic properties of the lithosphere may be revealed by a further order-of-magnitude improvement in the accuracy of the magnetometer measurements at minimum orbital altitude.
Document ID
20030025336
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Kim, Hyung Rae
(Ohio State Univ. Columbus, OH, United States)
vonFrese, Ralph R. B.
(Ohio State Univ. Columbus, OH, United States)
Taylor, Patrick T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kim, Jeong Woo
(Sejong Univ. Seoul, Republic of Korea)
Park, Chan Hong
(Korea Ocean Research and Development Inst. Ahnsan, Korea, Republic of)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-7645
Distribution Limits
Public
Copyright
Public Use Permitted.
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