Magnetic models for the United States for 1985
Circular
1039
By: Norman W. Peddie and Audronis K. Zunde
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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).
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Magnetic models for the United States for 1985 |
| Series title | Circular |
| Series number | 1039 |
| DOI | 10.3133/cir1039 |
| 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. |
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