Open AccessWorld Magnetic Charts for 1985 ‐ spherical harmonic models of the geomagnetic field and its secular variation
Author(s) -
Quinn J. M.,
Kerridge D. J.,
Barraclough D. R.
Publication year - 1986
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1986.tb01987.x
Subject(s) - secular variation , earth's magnetic field , geomagnetic secular variation , spherical harmonics , geodesy , variation (astronomy) , geophysics , magnetic declination , dipole , harmonic , geology , physics , magnetic field , geomagnetic storm , astrophysics , quantum mechanics
Summary. The 1985 World Magnetic Charts, published by the UK Hydrographic Department and by the US Defence Mapping Agency, have been produced jointly. They are based on spherical harmonic models of the main geomagnetic field (168 coefficients) and of the secular variation (80 coefficients). These models are presented here with a discussion of the data on which they are based and of the methods used to derive them. Positions of the dip‐poles, the geomagnetic poles and the eccentric dipole, together with their rates of change, are derived from the models.