On the difference between the average values of B-r(2) in the Atlantic and Pacific hemispheres

Citation:
Walker, AD, Backus GE.  1996.  On the difference between the average values of B-r(2) in the Atlantic and Pacific hemispheres. Geophysical Research Letters. 23:1965-1968.

Date Published:

Jul

Keywords:

geomagnetic secular variation, magnetic-field, reversals, spectrum

Abstract:

Recent work on reversals of the earth's magnetic field [Clement, 1991; Constable, 1992; Laj et al., 1991; Runcorn, 1992] and work on low rates of change of the radial magnetic field, B-r, in the Pacific hemisphere (see Jacobs [1994] page 8, for a summary) suggest that the statistics of B-r differ between the Pacific and Atlantic hemispheres. The question of statistical invariance of the magnetic field is interesting in its own right [Courtillot et al, 1992], and we study this hypothesis by investigating the statistical significance of the difference between the average value of B-r(2) in the Atlantic and Pacific hemispheres at three different radii. The differences between the average value of B-r(2) in the Atlantic hemisphere and the average value of B-r(2) in the Pacific hemisphere at all three radii are incompatibly large with two statistical models of B-r. The differences are incompatibly large at two of three radii when a third statistical model is used. The results suggest that further work on the statistical properties of B-r is warranted and provide another test for normality of spherical harmonic coefficients.

Notes:

n/a

Website

DOI:

10.1029/96gl01854