Physics of auroral phenomena : proceedings of the 38th annual seminar, Apatity, 2-6 march, 2015 / [ed. board: A. G. Yahnin, N. V. Semenova]. - Апатиты : Издательство Кольского научного центра РАН, 2015. - 189 с. : ил., табл.

Occurrence o f GPS signals phasefluctuations during auroral activity Figure 6 . Daily dynamics of the irregularity oval in dependance on a geomagnetic activity from 30.09.2013 to 03.10.2013 Fig. 7 shows norths snd south borders of the auroral oval and TEC irregularities during from 01.10.2013 to 03.10.2013 at the TIXI station (71.38N, 128.52E). Width of the auroral oval rise during local night time and the oval of TEC irregularities mostly follow the auroral oval. It was a case sudy and next studies should be devoted to statistical ratio of position of both ovals. 12 _ 0.5 J 2 . 0 . 5 i-L - —<1.5 ^ I X * * X L . , 1-0.4 / ЯШШШкЛ \ И—0.4 / \ И -0.4 l -о.з Z / / ' |- о . з z I Y ' f A>\ ■-«.з - 0 .0 "—I— - 0 .0 —---- — 0.0 0 0 0 2013 October, 1 2013 October, 2 2013 October, 3 TIXI (71.38,128.52) TIXI (71.38,128.52) TIXI (71.38, 128.52) Figure 7. Boudaries of auroral oval and space time distribution of TEC irregularities by TIXI data. Auroral ovals showed by bold lines, TEC irregularities ovals showed by patches Conclusions During 2 October 2013 geomagnetic storm the intensive TEC fluctuations were observed at auroral and subauroral ionosphere. Joint analysis of observed phase fluctuations of GPS signals, and fluctuations of the geomagnetic field showed good agreement of both events during auroral activity. In time the maximal activity aurora the intensive phase fluctuations were registered even at midlatitude station Kaliningrad. In combination with optical and geomagnetical measurements this fact is explained by an expansion of the auroral oval towards the equator during high geomagnetic activity. Acknowledgment. We thank the Institutes who maintain the IMAGE Magnetometer Array, Grants of RFBR 14- 05-98820 r-sever-a and 14-07-00512. References [1] ForteB., Radicella S. Geomtrical control ofscintillation indicesWhat happens for GPS satellites // Radio Science, V. 39, 2004. [2] Afraimovieh E. L., Astafyeva E. I., Demyanov V. V., Gamayunov I. F. Mid-latitude amplitude scintillation of GPS signals and GPS performance slips IIAdvances in Space Research. V. 43, pp. 964-972, 2009. [3] Prikryl P., Jayachandran P. Т., Mushini S. C. GPS TEC, scintillation and cycle slips observed at high latitudes during solar minimum // Annales Geophysicae, V. 28, pp. 130 [4] Chemouss S.A., Kalitenkov N.V. The dependence of GPS positioning deviation on auroral activity // International Journal ofRemote Sensing, V. 32(1), pp. 3005-3017, 2011.7-1316, 2010. [5] Shagimuratov I.I., Efishov I.I., Tepenitsyna N.Yu. Similarities and Differences of storm time occurrence of GPS phase fluctuations at northern and southern hemispheres // in Proceeding EuCAP 2009, 2009. [ 6 ] Shagimuratov I.I., Krankowski A., Efishov I.I.., Cherniak Yu.V., Wielgosz P., Zakharenkova I.E. High latitude TEC fluctuations and irregularityoval duringgeomagnetic storms IIEarthPlanets Space, V. 64(6), pp. 521-529,2012. [7] Aarons J. GPS systemphase fluctuations at auroral latitudes IIJournal ofGeophysicalResearch, 102, A 8 ,pp. 17219-17231,1997. [ 8 ] Pi X., Mannucci A. J., Lindqwister U. J., Но С. M. Monitoring of global ionospheric irregularitites using the worldwide GPS network II Geophysical Research Letters, V. 24 (18), pp. 2283-226, 1997. [9] Feldstein, Y. I., Auroral Oval // Journal ofGeophysical Research, V.78 (7), 1210-1213 (1973). [10] Staikov, G. V., Mathematical model ofthe auroral boundaries // GeomagnetismandAeronomy, 34,331-336 (1994). [11] F. Sigemes. M. Dyrland, P. Brekke, E. K. Gjengedal, S. Chemouss, D. A. Lorentzen, K. Oksavik and C. S. Deehr. Real time aurora oval forecasting - SvalTrackll. //' Optica Рига у Aplicada (OPA), 44, 599-603, 2011. 110