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Original Articles

ON THE DERIVATION OF MAGNETIC SECULAR VARIATION FROM FIELD OBSERVATIONS

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Pages 75-83 | Published online: 22 Mar 2010
 

Abstract

Irregular fluctuations superimposed on the normal secular variation of the geomagnetic elements and related to solar activity, are discussed on a qualitative basis. Since a field survey may extend over a considerable period of time these fluctuations may affect the computed values of secular variation differently at the various stations. It is therefore advisable to reduce all the observations taken during a particular field survey, as well as the corresponding values at the control observatory, to a common epoch. It is suggested that smoothed curves of the observatory minus field station differences be used for this purpose.

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