Call for candidate models for IGRF, 1995 revision



IAGA Working Group V-8 (Analysis of the global and regional geomagnetic field and its secular variation) is seeking numerical models of the main-field and its secular variation as candidates for the 1995 revision of the International Geomagnetic Reference Field. The following spherical harmonic models are required: a definitive main-field model for epoch 1990.0 (IGRF 1990); an interim main-field model for epoch 1995.0 (IGRF1995); a secular variation model for the interval 1995.0-2000.0 (as part of IGRF 1995); and, possibly, a definitive main-field models at 5-year epochs from 1900.0 to 1940.0.