ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 4, pp. 249-262

Studying the seasonal pattern of ionospheric variability over Eastern Siberia and Far East region from GPS/GLONASS data

A.S. Yasyukevich 1 , M.A. Chernigovskaya 1 , A.A. Mylnikova 1 , B.G. Shpynev 1 , D.S. Khabituev 1 
1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
Accepted: 25.05.2017
DOI: 10.21046/2070-7401-2017-14-4-249-262
We studied ionospheric variability from analysis of vertical total electron content (TEC) variations over the Eastern Siberia and Far East regions during the 2002–2015 period. TEC data were obtained from the phase of dual-frequency GPS/GLONASS receivers. We used TEC variation coefficient which is a normalized TEC dispersion in daytime to describe the high-frequency part of ionospheric variability. This coefficient represents the level of internal gravity waves (IGW) activity in the ionosphere. Analysis of the variability changes with season and solar and geomagnetic activity has revealed significant deviations of the TEC variation coefficient throughout a year. The lowest coefficient values are registered at all stations in summer months. The maximum of TEC variability level exists in winter and it exceeds up to 6 times the summer time variations. These variations are regularly observed from year to year and not associated with helio- geophysical conditions changes. The considered ionospheric variations are assumed to be caused by IGW propagating into thermosphere from the lower atmosphere. These mesoscale wave-like disturbances are generated in the spatially inhomogeneous, high-speed jet streams associated with winter stratospheric circumpolar vortex (CPV). Based on ECMWF ERA-Interim reanalysis data we revealed a significant increase in wave activity at the strato-mesosphere heights from November to February for all the years considered. Mesoscale wave-like disturbances generated within a CPV area can be partly transmitted upward. Propagating upward IGWs transfer atmospheric constituents into the mesosphere and lower thermosphere. This leads to molecular gas inflow or outflow at these heights altering, as a result, the [O]/[N2] ratio and causing ionospheric variation.
Keywords: middle and high atmosphere, ionosphere, atmospheric layers interaction, wave-like disturbances, TEC, GPS, GLONASS
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