A solar eclipse (SE) can cause disturbances in all subsystems of the Earth — atmosphere — ionosphere — magnetosphere system, including the geomagnetic field. Using data obtained at 15 stations of the INTERMAGNET network, the temporal variations of all components of the geomagnetic field were analyzed. It was established that the SE was accompanied by a disturbance in the level of the X-, Y- and Z-components. The largest disturbances occurred for the X-component (south-north). A strong tendency towards increasing the disturbance magnitude in the X-component level with increasing the area of solar disk obscuration was observed. Calculation of the disturbance magnitude in the X-component level under the SE influence has been performed. It was believed that the main mechanism for generating the magnetic effect was a disturbance in the system of ionospheric currents at the dynamo region heights. The results of observations and calculations are in good agreement with each other. In addition to the persistent aperiodic effect lasting about 100...180 min, an increase in the range of fluctuations in the geomagnetic field level throughout the SE was observed. This may indicate the generation of quasi-periodic geomagnetic field disturbances in the range of atmospheric gravity waves.