Physics of auroral phenomena : proceedings of the 40th annual seminar, Apatity, 13-17 March, 2017 / [ed. board: N. V. Semenova, A. G. Yahnin]. - Апатиты : Издательство Кольского научного центра РАН, 2017. - 143 с. : ил., табл.

latitudes ~ (75-85)°. We believe that the emergence and intensification of these current systems lead to the occurring of specific polar-latitude bay-like magnetic disturbances recorded in the daytime sector by ground magnetometers. Daytime magnetosphere-ionosphere disturbances in response to sharp increases in the solar wind dynamic pressure 21.06.2015 15:34- 15:53 UT 21.06.2015 18:42-18:51 UT 22.06.2015 19:42- 19:51 UT 71.7 78.7 83.9 82.1 75.7MLAT 9:9 9:1 6:5 2:2 0:7 MLT 69.7 77.2 83.9 84.7 78.5 MLAT 10:4 9:9 8:4 2:7 0:5 MLT 70.0 77.5 84.6 85.5 78.5 MLAT 11:4 11:8 13:2 20:0 21:8 MLT SWARM A 15:55 16:05 58.8 86.90 17:22 08:32 16:15 UT 52.60 MLAT 06:23 MLT ГШ1 18:20 56.70 18:41 18:30 87.50 07:45 18:40 UT 52.00 MLAT 06:40 MLT •Г-*Ttf;■'VM ww\ i * № m K W:\! V E i l i ' t ; ||-l. •• 18:45 40.90 17:16 18:55 79.20 16:71 •'I i 19:05 UT 64.80 MLAT 06.16 MLT Figure 4. Trajectories o f SWARM A, С satellites (blue and red lines) on 21.06.2015 before and after the arrival o f the shock fronts (top panel) (green line shows the simultaneous spans o f DMSP satellites); variations of the east-west component of the magnetic field, measured by the SWARM A (middle panel); spectrograms o f the DMSP satellites (bottom panel). References 1. Gromova L.I., Kleimenova N.G., Levitin A.E., Gromov S.V., Dremukhina L.A., Zelinskii N.R. Daytime geomagnetic disturbances at high latitudes during a strong magnetic storm of June 21-23, 2015: The storm initial phase. Geomag. Aeron. (Engl.Transl.), v. 56, N 3, p. 281-292, 2016. DOI: 10.1134/S0016793216030051 2. Lukianova R. Effect of abrupt changes in the solar wind dynamic pressure on the polar cap convection. Geomag. Aeron. (Engl.Transl.), v. 44, N 6, p. 691-702, 2004. 3. Belenkaya E.S. Transition current systems in the Earth’s and Saturn’s magnetospheres. Geomag. Aeron. (Engl.Transl.), v. 46, N 5, p. 570-579, 2006. 18