Other
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geoji.100..469s&link_type=abstract
Geophysical Journal International (ISSN 0955-419X), vol. 100, March 1990, p. 469-475.
Other
4
Dynamo Theory, Geomagnetism, Ionospheric Currents, Magnetic Variations, Secular Variations, Solar Magnetic Field, Electrical Resistivity, Equatorial Electrojet, Sunspots
Scientific paper
Secular changes in the solar geomagnetic variation at 11 observatories with a worldwide distribution have been studied. The secular changes at UK observatories were found to be large. Numerical calculations, details of which are described in this paper, agree in predicting the large changes at UK observatories. The numerical calculations also predict a large secular change in Sq at Hermanus in all elements; this would be expected as the main field at this station shows a large secular change. The secular change in Sq observed at Hermanus is, however, found to be fairly small compared with that observed at the other stations.
Butcher E. C.
Schlapp D. M.
Sellek R.
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