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Estimating Antarctic Near-Surface Magnetic Anomalies from Oersted and CHAMP Satellite Magnetometer ObservationsSignificant improvement in predicting near-surface magnetic anomalies can result from the highly accurate magnetic observations of the CHAMP satellite that is orbiting at about 400 km altitude. In general, regional magnetic signals of the crust are strongly masked by the core field and its secular variations due to wavelength coupling in the spherical harmonic representation and thus are difficult to isolate in the satellite measurements. However, efforts to isolate the regional lithospheric from core field components can exploit the correlations between the CHAMP magnetic anomalies and the pseudo magnetic effects inferred from gravity-derived crustal thickness variations. In addition, we can use spectral correlation theory to filter the static lithospheric field components from the dynamic external field effects. Employing these procedures, we processed the CHAMP magnetic conservations for an improved magnetic anomaly map of the Antarctic crust. Relative to the much higher altitude Oersted and noisier Magsat observations, CHAMP magnetic anomalies at 400 km altitude reveal new details on the effects of intra-crustal magnetic features and crustal thickness variations of the Antarctic. Moreover, these results greatly facilitate predicting magnetic anomalies in the regional coverage gaps of the ADMAP compilation of Antarctic magnetic anomalies from shipborne, airborne and ground surveys. Our analysis 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.
Document ID
20040171248
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
vonFrese, Ralph R. B.
(Ohio State Univ. Columbus, OH, United States)
Kim, Hyung Rae
(Maryland Univ. Greenbelt, MD, United States)
Gaya-Pique, Luis R.
(Istituto Nazionale di Geofisica Rome, Italy)
Taylor, Patrick T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Golynsky, Alexander V.
(Academy of Sciences (USSR) Saint Petersburg, USSR)
Kim, Jeong Woo
(Sejong Univ. Seoul, Korea, Republic of)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Geophysics
Meeting Information
Meeting: 2004 Fall AGU Meeting
Country: Unknown
Start Date: January 1, 2004
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Other

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