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Magnetic models for the United States for 1985

Circular 1039

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Abstract

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).

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Magnetic models for the United States for 1985
Series title:
Circular
Series number:
1039
Edition:
-
Year Published:
1990
Language:
ENGLISH
Publisher:
U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center,
Description:
iii, 26 p. :ill. ;28 cm.