Skip to main content
U.S. flag

An official website of the United States government

Localized sudden changes in the geomagnetic secular variation.

January 1, 1987

There is much debate as to whether there was a worldwide geomagnetic jerk in 1969 or 1970. It is agreed that there was an unusual sharp change in the secular variation in the east component, Y, in Europe at that time. This note points out how a localized sudden change in the secular variation pattern of one component in Europe can occur without having any large worldwide effects in any of the components. The accompanying changes in the spherical harmonic coefficients for such a localized change are also discussed. 

Publication Year 1987
Title Localized sudden changes in the geomagnetic secular variation.
DOI 10.5636/jgg.39.111
Authors L.R. Alldredge
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Geomagnetism & Geoelectricity
Index ID 70015171
Record Source USGS Publications Warehouse