from 01.01.1975 to 01.01.2021
Irkutsk, Irkutsk region, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
Ulaanbaatar, Mongolia
Paratunka, Kamchatka, Russian Federation
Sodankyulya, Finland
Irkutsk, Russian Federation
Apatity, Russian Federation
Apatity, Russian Federation
Irkutsk, Russian Federation
It is shown that a diamagnetic structure (DS) of the slow solar wind (SW), the source of which on the Sun was a chain of streamers, arrived at Earth’s orbit on December 22, 2015. It interacted with Earth’s magnetosphere under conditions when the northward Bz component of the interplanetary magnetic field (IMF) remained for a long time in preceding undisturbed SW. The interaction and a sharp change in the direction of Bz to the south generated an isolated substorm whose duration depends on the duration of interaction with the DS. The substorm began at midday with the passage of the DS into the magnetosphere and spread to the east. All phases of the substorm — growth, expansion, and recovery — were observed for two hours. Variations in the SW and IMF parameters are shown to coincide for the isolated substorm whose energy source was the slow solar wind DS, and a trigger was the abrupt change in the direction of the vertical IMF component from north to south. The coincidence is justified by statistical generalizations of the same parameters in 40 % of cases of long-term observations of individual substorms whose trigger was a change in Bz direction.
diamagnetic structure, global isolated substorm, change in the Bz direction, trigge
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