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A compressed marine data set for geomagnetic field modelingSome 13 million scalar magnetic field data points that have been collected from the world's ocean areas reside in the collection of the National Geophysical Data Center. In order to derive a suitable data set for modeling the geomagnetic field of the earth, each ship track is divided into 220 km segments. The distribution of the reduced data in position, time and local time is discussed. The along-track filtering process described has proved to be an effective method of condensing large numbers of shipborne magnetic data into a manageable and meaningful data set for field modeling. This process also provides the benefits of smoothing short-wavelength crystal anomalies, discarding data recorded during magnetically noisy periods, and assigning reasonable error estimates to be utilized in the least squares modeling.
Document ID
19910030392
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Langel, R. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Baldwin, R. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ridgway, J. R.
(ST Systems Corp. Lanham, MD, United States)
Davis, W. Minor
(NOAA, National Geophysical Data Center Boulder, CO, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Journal of Geomagnetism and Geoelectricity
Volume: 42
Issue: 9, 19
ISSN: 0022-1392
Subject Category
Geophysics
Accession Number
91A15015
Distribution Limits
Public
Copyright
Other

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