Physics of auroral phenomena : proceedings of the 39th annual seminar, Apatity, 29 February-4 March, 2016 / [ed. board: N. V. Semenova, A. G. Yahnin]. - Апатиты : Издательство Кольского научного центра РАН, 2016. - 167 с. : ил., табл.

Substorm observations of the MAIN in Apatity during St. Patrick's Day geomagnetic storms in 2013 and 2015 18:26:40 18:27:20 18:29:00 18:32:00 18:33:40 18:36:30 Figure 4. Development of the two substorms on 17 March 2013 by chosen all-sky images. Fig. 4 shows the dynamics of auroras according to the all-sky camera data during substorms on 17 March 2013. The all-sky camera in Apatity registered the substorm onset at 18:26:40 UT and the second substorm intensification at 18:39:40 UT. The top panel shows some all-sky camera images taken during the first substorm, the bottom panel shows images from the second substorm. The world directions are marked in the first image; the universal time is written above each image. The substorm beginning to the South from the station, the arcs movement to the North, reaching the station zenith (18:32 UT) and surpassing it are seen. The second intensification at Apatity begins with an equatorial arc burst at 18:39:40 UT. After that, auroras move toward zenith, reach it at 18:41:40, and continue moving northward. Conclusions 1. Substorms, originated during the main storm phase or near the SYM/H minimum in the recovery phase, occurred to the South of Apatity (63.86CN GMLat.), and substorm auroras expanded in North direction. 2. For substorms during the recovery phase or the late recovery phase, auroras were observed near the station zenith or to the North of the Apatity station, and their motion from North to South was registered. 3. The boundary between both types of substorms in terms of SYM/H index is in the range 40-50 nT. 4. The maximal relative intensity of the substorm features in the camera field of view is considerably larger during the substorms arised to the South from Apatity. A c kn ow ledgm en ts. This study was supported by Program No 7 of the Presidium of RAS. The study is part o f a joint Russian - Bulgarian Project “The influence of solar activity and solar wind streams on the magnetospheric disturbances, particle precipitations and auroral emissions” of PGI RAS and IKIT-BAS under the Fundamental Space Research Program between RAS and BAS. References 1. Gonzalez W.D., A.L.C. Gonzalez, B.T. Tsurutani (1990), Dual-peek solar cycle distribution of intense geomagnetic storms. Planet. Space Sci. 38, 181-187. 2. Huttunen K.E.J., H.E.J. Koskinen, A. Karinen, K. Mursula (2006) Asymmetric development o f magnetospheric storms during magnetic clouds and sheath regions. Geophys. Res. Lett. 33, L06107, doi:10.1029/2005GL024894. 3. Pulkkinen T.I., N.Y. Ganushkina, E.I. Tanskanen, M. Kubyshkina, G.D. Reeves, M.F. Thomsen, C.T. Russel H.J. Singer, J.A. Slavin, J. Gjerloev (2006), Magnetospheric current systems during stormtime sawtooth events J Geophys. Res. 111, AI1S17, doi:10.1029/2006JA011627. 4. Yermolaev Yu.I., M.Yu. Yermolaev (2006), Statistic study on the geomagnetic storm effectiveness o f solar and interplanetary events. Adv. Space Res. 37, 11 75-1181. 5. Tsurutani B.T., E. Echer, K.Shibata, O.P. Verkhoglyadova, A.J. Mannucci, W.D. Gonzalez, J.U. Kozyra, M Patzold (2014), The interplanetary causes of geomagnetic activity during the 7 -17 March 2012 interval- a CAWSES II overview. J. Space Weather Space Clim., 4, A02, DOI: 10.105 l/sw sc/2013056. 14