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.

Simultaneous obsen’ations of gravity waves in aurora and by partial reflection radar The received pictures of the luminescence intensity have been compared with measurements of amplitudes of reflections of ordinary and extraordinary waves of the partial reflections radar in the observatory Tumanny of the Polar Geophysical Institute (69.0° N. 35.7° E) [Tereshchenko et al, 2003]. Time. UT Figure 3. Variations of luminosity intensity of the night sky above the northerner sector over Lovozero, 25-26 February 2012 (solid curve), and reflected ordinary wave amplitude from 90 km (dashed curve). Slowly changing variations are removed from both curves 2. Results o f observations On the ascafilms of the all-sky camera of the Lovozero observatory which was used for record of the aurora it was found out that sometimes the sky luminescence had wave pictures with the spatial periods of several tens kilometers which were slowly changing with the temporal periods of 15-30 minutes. This luminescence can not be identified with auroras and morphologically corresponds to acoustic-gravity waves. Such waves were registered also on similar cameras, but with the filters which were specially picked up for photography of luminescence at the heights about 80-90 km, for example, of Na, OH, OI, 02(0, 1). The sample of the wavy luminescence registered by us is given in Fig. 1. The camera worked without an optical filter and its maximum sensitivity is in the green range where there is the OI emission of 557.7 nanometers, the exposition was 0.05 second. In the pictures the orientation of the camera and universal time of shots are specified. The wavy structure of the strips extended from the northeast to the southwest with wavelength about 100 km is well visible. AGW are registered and studied as well in PGI on the radar of partial reflections at the observatory Tumanny. In view of the big spatial extent of considered waves it makes sense to compare the optical observations with the radar ones. The reflected amplitudes of the ordinary and extraordinary waves of the radar were analyzed and filtered by the digital bandpass elliptic filter with the periods from 10 to 90 minutes. In Fig. 2 filtered amplitude variations of the reflected ordinary wave of the radar and the wavelet spectrum of this amplitude for time of the case in Fig. 1 are shown. The wave structure of reflection amplitude with the periods about 20-30 minutes is well visible. The ascafilms of the night sky were received with the frequency of one picture per second, the dynamic range of the camera was 2 bytes, i.e. 65536, that allowed to build figures of intensity behavior in the chosen segments of the sky. Such variations have been constructed for eleven circles of the sky. Slowly changing components have been removed and it was revealed that there were variable components with the period of 15-30 minutes at some sites of the sky. For the northern site of the sky located over Tumanny the curve of intensity is shown in Fig. 3 by the solid line. One can see in the figure the period about 30 minutes. The dashed curve is the amplitude reflected from the 90 km altitude after detrending by a cubic polynomial. Both the curves are similar. Such similarity can be considered as good one if to remember that the photometric curve integrates intensity of luminescence in the circle of the diameter of 60° near the horizon and so reflects, in the basic, change of integrated intensity, but the radar curve shows spatial movements in the region of reflection over the radar. Other case of simultaneous observations of AGW by the optical way and the radar took place in the local morning on 28 January 2012. It was the Radar amplitude, mV Figure 4. Altitude profiles of the reflected ordinary wave amplitude for the case of 28 January 2012 102