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Diurnal corrections to magnetic surveys—an assessment of errorsNormal access

Author: R. P. Riddihough
Journal name: Geophysical Prospecting
Issue: Vol 19, No 4, December 1971 pp. 551 - 567
DOI: 10.1111/j.1365-2478.1971.tb00900.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 1.04Mb )

Summary:
The comparison of a group of continuous total field stations in Ireland with the record of the total field from Valentia Observatory enables the errors which would be involved in using the Observatory as a diurnal correction base to be examined. For the most part, for a single correction, these errors lie between ± 2 and ± 6 gammas. However, they have three notable characteristics: (i) they are not closely dependent on the magnetic ‘noisiness’ of the day, (ii) they are only marginally reduced by the application of station-base time differences and (iii), they are strongly related to differences between the amplitude of the daily magnetic variation at the station and at the base. A permanent geographical basis for the latter differences enables a system for the estimation of the errors to be proposed.


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