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Magnetic models for the United States for 1985

January 1, 1994

New models describing the magnetic field in the United States at the beginning of 1985 and the rate of change expected during the next few years have been developed. The models--which will serve as the basis for a new set of magnetic charts--were derived from several tens of thousands of original field measurements from land, marine, and aerial surveys; from values derived from the MAGSAT-based International Geomagnetic Reference Field; and from recent data from magnetic observatories and repeat stations. , They are in the form of spherical harmonic series that represent the scalar magnetic potential from which all the field components can be derived. The models for the conterminous States and Alaska are of maximum degree and order 4 (24 coefficients each) and the models for Hawaii are of maximum degree and order 2 (8 coefficients each).

Citation Information

Publication Year 1990
Title Magnetic models for the United States for 1985
DOI 10.3133/cir1039
Authors Norman W. Peddie, Audronis K. Zunde
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Circular
Series Number 1039
Index ID cir1039
Record Source USGS Publications Warehouse