Study of the level of total electron content disturbance in the middle-latitude and Arctic regions by GPS data Natalia P. Perevalova (1), Ilya K. Edemskiy.

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Presentation transcript:

Study of the level of total electron content disturbance in the middle-latitude and Arctic regions by GPS data Natalia P. Perevalova (1), Ilya K. Edemskiy (1), Olga V. Timofeeva (1, 2), Darya D. Katashevtseva (1, 2), Anna S. Polyakova (1) (1) Institute of Solar-Terrestrial Physics, SB RAS (2) Irkutsk State University Bolshie Koty, Russia

Baikal School, Total Electron Content (TEC) The total electron content I is the electron density Ne integrated along a beam: TEC calculation using the phase measurements at two GNSS frequencies: TEC

Baikal School, WTEC index  GPS/GLONASS station exercises control of TEC variations in a radius of km;  The time observation of a GPS satellite at the station is about 2-6 hours. WTEC is multi-day series of averaged TEC disturbance [Berngardt O.I., Voeykov S.V., Ratovsky K.G. Using a single GPS/GLONASS receiver for estimating the level of ionospheric disturbance // XXXI URSI General Assembly and Scientific Symposium. Beijing, China. August 16-23, 2014: abstracts GP2.31]

Baikal School, Measurement data for 2013 Filtration period: minutes - medium-scale ionospheric disturbances; minutes- large-scale ionospheric disturbances. Planetary geomagnetic indexes: AE characterizes high latitudes; Dst, low latitudes; Kp, middle latitudes.

Baikal School, WTEC variations in March and June, 2013 The WTEC variations for two ranges of periods (01-10 min, min) at the NRIL, MOND, ORDA stations and behavior of Dst, Kp, AE geomagnetic indexes. The vertical dashed lines indicate sudden storm commencements. middle-latitudes high-latitudes geomagnetic indexes

ST at 100 km ST at 300 km Baikal School, Diurnal-seasonal WTEC variations The Diurnal-seasonal WTEC variations for ranges of periods of min (a, c) and min (b, d) at the NRIL (a, b) and MOND (c, d) stations. The black lines mark sunrise time at 100 km (solid) and 300 km (dashed). ST stands for the solar terminator.

CONCLUSIONS Baikal School, In Arctic region  The minimal level of disturbance intensity does not depend on the season.  WTEC behavior correlates well with the variations in AE index and does less with the behavior of the Dst index.  WTEC variations caused by the solar terminator are absent. In middle latitudes  Diurnal WTEC variations are particularly pronounced over the year and have also some seasonal features.  The minimal level of disturbance intensity in summer is higher than in winter.  The solar terminator generates intense large-scale ionospheric disturbances, but does not cause medium-scale ones.

THANK YOU FOR YOUR ATTENTION! Baikal School, 20158

Day of the year (UT) Time (t) nT Baikal School, 20159

Solar terminator 2013, days LT, h Baikal School,

Solar terminator Baikal School,

Все спутники GPS передают сигналы на двух одинаковых частотах: f 1 = МГц и f 2 = МГц Спутники ГЛОНАСС передают сигналы на разных частотах в двух диапазонах. Первый диапазон имеет центральную частоту f01= 1602 МГц, частота передачи спутников определяется по формуле: f1k=f01+k*Δf1 где Δf1=0,5625 МГц, k - номер частотного канала (k=-7,-6,-5,...0,...). Второй диапазон имеет центральную частоту f02 = 1246 МГц, частота передачи спутников определяется по формуле: f2k=f02+k* Δf2 где Δf2= МГц, k - номер частотного канала (k=-7,-6,-5,...0,...). Радиосигналы в ГНСС GPS и ГЛОНАСС Baikal School,