Features of the magnetic disturbance on September 7–8, 2017 by geophysical data

Abstract

The main feature of the geomagnetic disturbance which occurred on September 7–8, 2017, was that it consisted of two consecutive magnetic storms separated in time by ∼13 h. It was of interest to reveal its particular features, characteristics and geomagnetic field variations during both storms and the influence they had on the ionosphere. The results are as follows. The character of the development of the first storm and its impact on the Earth’s magnetosphere and ionosphere are significantly different from the character of the development and impact of the second storm. There are prominent differences in the geomagnetic field variations at different longitudes along the same latitude sector. The asymmetry of the dayside and nightside effects was revealed. The variations of the riometer absorption level, critical frequencies of the ionosphere and Total Electron Content in each considered observation point corresponded to the variations of the magnetic field at this point.