
TY  - JOUR
A1  - Reeves, C.V. 
T1  - Limitations imposed by geomagnetic variations on high quality aeromagnetic surveys
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 1993
VL  - 24
IS  - 2
SP  - 115
EP  - 116
KW  - 
UR  - https://doi.org/10.1071/EG993115 
N2  - The accuracy and sensitivity with which aeromagnetic anomaly data may be collected ? and presented as images for those who seek to maximise the representation of the geological information ? is limited by the thoroughness with which temporal variations are removed from the recorded total field data. Three processes are currently used consecutively to eliminate time-variations: base station subtraction, tie-line levelling and micro-levelling. Of these, the first two involve assumptions that are not entirely justifiable and the third is essentially an arbitrary filtering process. On profile data with a noise envelope of no more than ±0.1 nT, even the third process involves adjustments that can be many times larger than other uncertainties in the data. 
ER  -

