A study of alternative schemes for extrapolation of secular variation at observatories

Details A study of alternative schemes for extrapolation of secular variation at observatories A study of alternative schemes for extrapolation of secular variation at observatories

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pepi...11p..18a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 11, Issue 4, p. P18-P25.

Physics

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The geomagnetic secular variation is not well known. This limits the useful life of geomagnetic models. The secular variation is usually assumed to be linear with time. It is found that attenative schemes that employ quasiperiodic variations from internal and external sources can improve the extrapolation of secular variation at high-quality observatories. Although the schemes discussed are not yet fully applicable in worldwide model making, they do suggest some basic ideas that may be developed into useful tools in future model work. Address: U.S. Geological Survey, Denver Federal Center, Stop 964, Denver, Colorado 08225, U.S.A.

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