Re: about QAQC'ing magnetometers Dear all,
At the moment I am supervising a ground magnetic survey in Scandinavia with a base station (GEM) and two rovers (GEM and Geometrics). Everytime I run such a survey, I test the instruments before and after the survey, sometimes even during the survey. How I do this is that I set up all magnetometers as base stations at the base station site, and let them run for a full day, or as long as the batteries last. After the diurnal observation, I firstly compare the base station with the nearest magnetic observatory, in this case Lycksele. This comparison is only qualitatively, since the exploration site is about 400 km from the observatory. I then compare all rovers with the base station. I would like to share with you these results: Before the survey, both rovers were showing no difference with the base station. After the survey, they are both showing a shift. Have you observed something similar during your surveys? Regards, -- *Sergio Espinosa, Ph.D., P.Geo* Director, Geophysics *S E G*eoscience & *Ex*ploration
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