Abstract
The geoeffectiveness of the solar wind is usually determined on Earth by such phenomena in the geomagnetic field as storms and substorms. The second, no less significant effect is a sharp decrease in the intensity of galactic cosmic rays (GCR) Forbush effects. A joint examination of these effects in the geomagnetic field and in the GCR makes it possible to obtain additional diagnostic features, since they carry different information. The behavior of the geomagnetic field reflects changes in the magnetosphere, while the GCR intensity depends on the spatial configuration of the magnetic field in the heliosphere. To carry out such work, it is proposed to use the Forbush-Storm classification — a catalog of geophysical events in the geomagnetic field and cosmic rays. The catalog shows the dates and time of the beginning of the events of a decrease in the Dst geomagnetic field index and in GCR intensity from 1996 to 2017, for 2 cycles of solar activity. It is shown that these two types of terrestrial manifestations of interplanetary disturbances can occur simultaneously or separately.
Highlights
This paper describes one of the possible methods for diagnosing the interaction of disturbed structures of the solar wind and the Earth's magnetosphere on the basis of ground-based observations of the geomagnetic field and galactic cosmic rays (GCR)
The first is the investigation of geomagnetic phenomena - storms and substorms [1,2,3,4,5,6,7,8,9,10], the second is the analysis of GCR variations, including Forbush effects - decreases in the GCR intensity during geomagnetic storms [11,12,13,14,15].The study of geomagnetic phenomena is based on the analysis of magnetospheric phenomena
The result was the assumption that three classes ground-based events exist due to different trajectory of Earth through the disturbed solar wind flux
Summary
This paper describes one of the possible methods for diagnosing the interaction of disturbed structures of the solar wind and the Earth's magnetosphere on the basis of ground-based observations of the geomagnetic field and galactic cosmic rays (GCR). The last line of each table (Fig. 1, c) shows the results of calculating the annual average values of the main phase duration, the intensity of geomagnetic storms and GCR decreases, and the number of events of each class.
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