Open AccessA definitive model of the geomagnetic field and its secular variation for 1965 — I. Derivation of model and comparison with the IGRF
Author(s) -
Barraclough D. R.,
Harwood J. M.,
Leaton B. R.,
Malin S. R. C.
Publication year - 1978
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.1978.tb04750.x
Subject(s) - secular variation , earth's magnetic field , geodesy , geomagnetic secular variation , geology , spherical harmonics , variation (astronomy) , geophysics , field (mathematics) , mathematics , mathematical analysis , magnetic field , geomagnetic storm , physics , quantum mechanics , astrophysics , pure mathematics
Summary. Using a very large body of post‐1955 data, a spherical harmonic model of the geomagnetic field and its secular variation is derived for 1965.0. This model is compared with the original International Geomagnetic Reference Field (IGRF) and with individual models used, or proposed for use, in producing the IGRF. Positions of the dip‐poles, the geomagnetic poles and the eccentric dipole are derived from the model, together with their rates of change, and comparisons are made with other estimates of these positions.