Physics of auroral phenomena : proceedings of the 34th Annual seminar, Apatity, 01 - 04 March, 2011 / [ed.: A. G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 231 с. : ил.

Number of signals Number of signals Seasonal variations o fdominating arrival directions o f registered lighting signals as an indicator o fannual motion o fworld thunderstorm centers 6 9 12 15 Time (UT), hours 6 9 12 15 18 21 Time (UT), hours 25.01.2009 06.06.2007 Fig. 1. Two examples of daily distribution of azimuths. Azimuth, deg Winters 2006-2008 Azimuth, deg Springs 2006-2008 70000 60000 50000 40000 30000 Azimuth, deg Azimuth, deg Summers 2006-2008 Autumns 2006-2008 Fig. 2. Distributions of arrival azimuth of signals, registered for day (averaged for each season). 195