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.

О.M. Barkhatova et al. Fig. 2. Examples of dynamic spectra index AU, two ionospheric and two magnetic stations (from top to bottom) for April 4 (left) and April 5 (right) 2006 F ast"+" mode Slow " mode 10 9 8 7 ® r- (Л 6 <0 a s > , 4 3 2 1 0 1 2 3 4 * °C 1 2 3 4 5 Fig. 3. The phase velocities of the MGW fast"+" mode and slow mode: solid line corresponds to the longitudinal MGW propagation (0 = 0°), small dotted line - the propagation at an angle (9 = 45 °) The experimental verification of the phase velocities values obtained by comparing of the geomagnetic field horizontal component dynamic spectra for the considered stations with minute resolution. It was found that the time shift of dynamic spectra in the region corresponding to MGW propagation is 5 - 15 min. In view of the distance between the magnetic stations and estimated velocities, a time like these corresponds to MGW propagation. 5. Summary The MGW dispersion curves in ionospheric medium in the context of finite conductivity are analyzed. By comparing of f0F2 dynamic spectra and the geomagnetic field horizontal component detected the MGW propagation from auroral source to the middle latitudes. The MGW characteristic parameters: the frequency about 10'4 -s- 4 • 10-4 Hz, the phase velocities values of the "+" mode about 4000 m /s, mode - about 3000 m / sec. Acknowledgements. This work is executed at partial support under grant of the RFBR 09-05-00495 and also program Ministry of Education and Science «Development of higher school scientific potential (2009-2011 project N 10266)». References Barkhatova О. M„ Barkhatov N. A., Grigoriev G. I. Detection o f magneto-gravity waves in the ionosphere by analysis o f the maximum observable frequencies on oblique-sounding paths // Radiophysics and Quantum Electronics V 52 N 10 P 683 698. 2009. Grigoriev G.I. Acoustic-gravity waves in Earth's atmosphere (review) // Radiophysics and Quantum Electronics V 42 N 2 P 3-25. 1999. ............................. Sorokin V.M., Fedorovich G.V. Physics o f slow MHD waves in the ionospheric plasma. Energoatomizdat M. 1982 136 McLellan A., Winterberg F. Magneto-gravity waves and heating o f the Solar corona // Solar Physics 4, 401-408 1968 124