We study variations of total electronic content (TEC) during typhoons, observed in the August-September 2016 in the North-West Pacific Ocean. The TEC data were obtained from phase dual-frequency measurements of GPS/GLONASS ground-based receivers. Using the indexes of ionospheric variability within different period ranges we revealed an increase in the intensity of ionospheric disturbances with periods of internal gravity waves (IGW-variability, from 2 minutes till 4 hours) at the stations located close to the typhoon regions. The most intensive variations are shown to be occurred after passage of the solar terminator and localized near the typhoon boundary. The greatest increase in TEC IGW-variability is recorded during the days of abrupt changes in the cyclones intensity (growth/fall in wind speed).
In this study, we present a new approach enabling to estimate the absolute vertical and slant total electron content (TEC) of the ionosphere. The estimate is based on using single-frequency joint measurements of phase and group delay of a GPS/GLONASS signal from separate measuring stations. The vertical TEC calculated by singlefrequency measurements agrees, qualitatively and quantitatively, with similar estimates based on dual-frequency measurements. A typical value of the vertical TEC difference obtained through single-frequency and dual-frequency techniques, does not surpass ~1.5 TECU with the root-mean-square deviation (RMSD) being up to ~3 TECU for the stations that we selected.
In the study there was carried out the analysis of the daily dynamics of the TEC, the intensity of variations changes and seasonally analysis of TEC variations for Yoshkar-Ola and Irkutsk, according to 2012.
We studied the dynamics of the GLONASS and GPS radio physical signal slips, as well as the slips in determining the total electron content (TEC) at the stations in the mid- and high-latitude regions under different geophysical conditions over 2014 Nov - 2015 Jul. At high latitudes, the pseudo-range P1 measurement slip density is shown to be lower for the GLONASS system, than that for GPS. At mid-latitudes, the TEC slip mean density (N1 TECU/min) under quiet geomagnetic conditions practically does not depend on the Kp and AE index behavior, and does not exceed 12%. At high-latitudes, N1TECU/min in winter is generally higher, than that in the summer, and may reach 50-60%. The N1 TECU/minvariation at highlatitudes correlates with the geomagnetic index behaviors; however, it depends on Kp and AE essentially differently. Under disturbed conditions, N1 TECU/min increases as AE grows more slowly, that it does under quiet conditions. On the contrary, N1 TECU/min growth as Kp increases under disturbed conditions occurs on a factor of 1,5 faster, than it does under quiet geomagnetic conditions. The N1TECU/min value dependences on the ionospheric disturbance index (Wtec) at mid- and high-latitudes are similar. An increase in the TEC slip density, N1TECU/min in wintertime occurs on a factor of 1,5 faster, than it does in summer. Simultaneously, at high-latitudes, the N1TECU/min growth with the Wtec increase occurs on a factor of 2-2,5 faster, than it does at the mid-latitudes.
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