Physics of auroral phenomena : proceedings of the 38th annual seminar, Apatity, 2-6 march, 2015 / [ed. board: A. G. Yahnin, N. V. Semenova]. - Апатиты : Издательство Кольского научного центра РАН, 2015. - 189 с. : ил., табл.

Substorms observations during geomagnetic active period at the beginning o fMarch 2012 Substorm presence was verified by ground-based data of IMAGE magnetometers network (using the meridional chain NUR-NAL). To study the substorm development data from the Apatity all-sky camera (images and keograms) and the Guppy F-044C (GC) camera with a field of view -67° (keograms) were used. Results The time interval 7 - 1 7 March 2012 (11 days) is one of the first major geomagnetically active periods o f the ascending phase of SC24. An overview of the interplanetary conditions during this examined period is presented in Fig. 1. f- н И s 10 Ы ЬО О н *s S -10 » ъ -20 I . 8< w -400 - 1 6 0 0 f 2.0E-* O.OE40, 0 0 я -1000 I f S2 к - * ( 2 S4 A v , 1 1 1 1 1 1 K i 1 К f K J yw A ' 1 1 V . И № 1 1 1 ' J - 1 j Г 1 1 г | M il * - 1 А с 1 1 . 1 1 1 л _ *Ч ч . f t i | { 1 ' T " i , | , - 1 1 1 i p T i T p i - i f " 1 ' ' ' 1 V " I I 1 1 I I I i i , , | , — +■ “ i i i i i i 12 16 20 06-20 March 2012 Figure 1. Solar wind and IMF parameters, AL and SYM/H indexes on March 7-20, 2012. Top-down: magnetic field magnitude and the IMF Bz component, the stream velocity V, the X component of the solar wind velocity, the density N, the temperature T, the solar wind dynamic pressure P, the geomagnetic index AL and the index SYM\H. The onset times of 4 events are marked by blue solid vertical lines and the symbols SI, S2, S3, S4, respectively. It is seen, that magnetic storms occurred on 7, 9, 12, and 15 March, and the associated interplanetary events are called the SI, S2, S3, and S4 events. All storms are associated with high solar wind speeds and enhanced plasma densities and temperatures and interplanetary magnetic field strengths. All storms were initiated by different interplanetary causes (Sheath, MC and HSS). Below the first (SI) and the second (S2) storm events are considered, in relation with two substorm observations by the all-sky camera in Apatity as typical examples of substorm developments over Apatity. The SI storm was caused by the southward directed Sheath fields; the main phase of the storm starts at -02:00 UT on 7 March and reaches a maximum at -05:15 UT. The SYM-H peak intensity was - -98 nT. The S2 storm on 9 March had a different nature and a different interplanetary cause than the event SI. This storm was caused by the 8