In magnetic exploration, in the process of measurements and processing, much attention is paid to taking into account daily changes (variations) of the magnetic field. Having compared the maximum amplitudes of daily changes in the magnetic field over a number of years and for a number of magnetic observatories, the author comes to conclusions that in some cases make it possible to partially exclude the influence of daily changes or not to introduce corrections due to their insignificant value.The conclusions can be characterized as follows (see article). Currently, magnetic observatories publish ten-day reviews of space data, which indicate the degree of disturbance in the Earth's magnetic field for each hour of each day. These surveys should be used to determine which days during field work there were significant magnetic disturbances and then correct for variations in observations made on these “stormy” days.
