Premium
Thirty year variations in the Earth rotation and the geomagnetic Gauss coefficients
Author(s) -
Yokoyama Yukiko
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl02688
Subject(s) - earth's magnetic field , earth's rotation , geodesy , gauss , physics , rotation (mathematics) , geomagnetic pole , variation (astronomy) , degree (music) , dipole , geomagnetic secular variation , phase (matter) , geophysics , scale (ratio) , moment (physics) , geology , geometry , mathematics , classical mechanics , magnetic field , astrophysics , geomagnetic storm , quantum mechanics , acoustics
Decade variations in the three components of the Earth rotation and low‐degree geomagnetic Gauss coefficients are examined. Variations with a time scale of 20–30 years are confirmed in both the Earth rotation and the magnetic axial dipole moment. The second degree tesseral Gauss coefficients also appear to have a variation with the same time scale. The components are characterized by high ellipticity of the g‐h path in the direction of 34°W. They appear to have phase change at around 1940. Considering the phase change, paths of the components and the mean pole have great similarity.