Technical Papers - Airborne Magnetics

Correcting Magnetic Temporal Variations with a Base Station

Marc A. Vallée*, Richard Smith, Fugro Airborne Surveys, and Régis Dumont, Geological Survey of Canada.

Presented at the 2003 SEG meeting in Dallas, Texas.

Abstract

Base station subtraction is one possible method for correcting temporal variations occurring during magnetic surveys. A field experiment comparing two base stations separated by 88 km on a quiet day shows that the field at one base station cannot predict the field at the other. The DC difference is approximately 107 nT and the non-DC residual is a few nT. Furthermore, in a second field experiment, base station subtraction cannot correct for 500 s period variations observed near auroral regions. Improvement in aeromagnetic data must rely on others techniques such as tie line leveling and micro-leveling.

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