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Any service which register and share data on magnetic field changes? It might be useful for dog-owners not just to observe strange behaviour of the pet but to u

• defrost 3y ago
  Your National Geophysical Organisation maps all that on a regular basis. Broad area mag surveys are flown in grids 80m above the ground with nine nano-tesla senistive magnetometers (wing tips and tail boom each have three on cartesian axis). To produce a level map they also run local base stations to record the daily diurnal mag fluctuations to subtract and normalise. That gets feed into the IGRF (International Geomagnetic Reference Field) and|or WMM (World Magnetic Model) to create parameters for five year epoh predictions. On a smaller scale many archeology groups and or soil engineers run smaller tighter grids dragging skids of walking arrays across an acre or more to create sub ground imaging. https://www.ncei.noaa.gov/products/international-geomagnetic-reference-field https://www.ncei.noaa.gov/products/international-geomagnetic... https://geomag.bgs.ac.uk/research/modelling/IGRF.html https://geomag.bgs.ac.uk/research/modelling/IGRF.html https://www.ncei.noaa.gov/products/world-magnetic-model https://www.ncei.noaa.gov/products/world-magnetic-model Here's some broad area airborne magnetic maps: https://www.energymining.sa.gov.au/industry/geological-survey/mesa-journal/previous-feature-articles/aeromagnetic-images-serving-geological-interpretation https://www.energymining.sa.gov.au/industry/geological-surve...