Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

ВЕНА VIOR OF IONOSPHERIC PARAMETERS AT MID-LATITUDE STATIONS DURING SEQUENCE OF GEOMAGNETIC STORMS ON SEPTEMBER 9-14, 2005 Island obtained in our calculation results are also observed in experiment. It is visible a good agreement of calculation results and experimental data o f foF2 above Grahamstown: the daytime positive effects and nighttime negative effects. The comparison o f foF2 disturbances, obtained in our calculation results, reveal enough a good agreement with experimental data. In addition, it is visible the solar flare effects in foF2 on September 14 above stations Ascencion Island, Grahamstown and Tashkent. In Fig. 4, it is shown the calculated behavior of vertical profiles of electron concentration above Millstone Hill on September 10, 2005 During geomagnetic storm it is visible the formation at night time such well-known event as G condition, when foF2 becomes smaller than fo F l. In addition, it is possible to note the decrease in electron density in maximum o f F2-layer and in external ionosphere above Millstone Hill at this time that speaks about the decrease in total electron content above this station. Table 2. Solar flares Day UT onset UT peak UT termination Ionospheric Effects UT onset UT peak UT termination September 10 19:10 19:36 19:50 19:18 19:44 19:58 September 10 21:30 22:11 22:43 21:38 22:19 22:51 September 11 12:44 13:12 13:53 12:52 13:20 14:01 September 13 19:19 19:27 20:57 19:27 19:35 21:05 September 14 10:05 10:38 10:54 10:13 10:46 11:02 Millstone 15 .09 12.09 UT, h — § UT, h £ UT, h UT, h UT, h Fig. 3. Behavior of foF2 above different ionospheric stations. Light and dark circles show the experimental data obtained from SPIDR at quiet and disturbed conditions. Model calculation results for quiet conditions are shown by crosses and for disturbed conditions by solid lines. 31