Physics of auroral phenomena : proceedings of the 35th Annual seminar, Apatity, 28 Februaru – 02 March, 2012 / [ed. board: A. G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2012. - 187 с. : ил., табл.

On triangulation by auroral cameras Altitude estimations for pulsating aurora Pulsing auroral forms are usually considered connected with developing of the instability in the magnetosphere [Trakhtengerts, 1984, Davidson, 1990, Trefall et al., 1975]. Simultaneous registration of such events as pulsing auroral forms, riometric absorption and ELF/VLF choruses in morning sector is usual for recovery phase of substorm and supports this point of view [Helliwell, 1965, Tagirov, 1986]. The models of VLF emission generation are based on cyclotron wave- particle interaction mechanism. According to such 2011/12/03 23:29:00 UT models the generation of waves is accompanied by a modification of particles pitch-angle distribution, that can lead to their precipitation in a loss cone. The dissipation of energetic particles in the atmosphere is accompanied by excitation of auroral emissions at altitudes of 90-200 km, that is observed by optical instruments [Helliwell et al., 1980; Tsuruda etal., 1981 ,Tagirov et al., 1999]. Detailed knowledge of the precipitated electron energy, especially in dynamics, can give important information for theory and modeling of these events [Trakhtengerts et al., 2005]. 23:29:04 UT APB APP Fig. 5. Triangulation of pulsing auroral event: region A is a diffuse background at -150 km, region В is a bright pulsing filament at -100 km. 2011/12/03 23:59:52 UT 23:59:54 UT APB APP Fig. 6. Triangulation of pulsing auroral event: filaments A and В are located at -97 km, filament С at -104 km. 43