Geophysical processes and biosphere: article

Аnnotation: The results of statistical analysis of geomagnetic activity in the Moscow region (central part of the Eastern European Platform) at Geophysical observatory «Mikhnevo» of Institute of Geosphere Dynamics of Russian Academy of Sciences (54.960º N; 37.774º E) and its relation to solar activity are presented. As a characteristic of geomagnetic activity we used the station geomagnetic K -index. When calculating the K -index by the method of adaptive smoothing, the results of instrumental observations of the geomagnetic field carried out at the Geophysical observatory «Mikhnevo» from 2009 to 2015 are involved. The geophysical situation of the Moscow region is characterized by a considerable number of days with a disturbed state of the geomagnetic field (for the analyzed period, magnetic storms were recorded in 181 cases and a disturbed geomagnetic situation was identified in 333 cases). At the same time, there is a tendency to increase geomagnetic activity with time: from 2009 to 2015, the number of days with disturbed geomagnetic conditions increased almost 8 times. Repeatability of geomagnetic disturbances is characterized by clearly pronounced periodicity with characteristic periods of about 14, 27, 60, 182 and 365 days. The total duration of geomagnetic disturbances, characterized by K ≥ 4, varies significantly with time. The evaluation of the correlation between the total number of geomagnetic disturbances characterized by the value of K ≥ 3 and 10.7 cm solar radio flux ( F 10.7) which is a measurement of the intensity of solar radio emissions with a wavelength of 10.7 cm (a frequency of 2800 MHz) indicates a significant correlation between the number of geomagnetic disturbances and solar activity.