Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977geoj...50..605h&link_type=abstract
Geophysical Journal, vol. 50, no. 3, Sept. 1977, p. 605-619.
Physics
10
Geomagnetism, Magnetic Variations, Solar Activity Effects, Sunspot Cycle, Dynamo Theory, Spherical Harmonics, Tables (Data)
Scientific paper
The variation of the geomagnetic field associated with the sunspot cycle is examined using an extensive data set. A method which takes into account the irregular nature of the solar cycle is used to represent the magnetic variation, particular attention being paid to the confidence limits of the results. Measures in both vertical and horizontal magnetic intensity were obtained at 81 observatories throughout the world. These results are used to derive a spherical harmonic model, from which the contribution that results from the sunspot cycle modulation of the daily geomagnetic variation is subsequently removed. The potential is then separated into parts of external (inducing) and internal (induced) origin, with the amplitude ratio internal/external equal to 0.12 plus or minus 0.07 and the phase difference equal to -8 plus or minus 30 deg. Examination of the residuals indicates the presence of local variations, on a timescale comparable with the solar cycle, that are uncorrelated with solar activity. These variations probably result from dynamo action within the core.
Harwood J. M.
Malin R. C. S.
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