Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 85-96
Ionospheric effects of sudden stratosphere warmings in East Siberian region of Russia
A.S. Polyakova
1 , M.A. Chernigovskaya
1 , N.P. Perevalova
1
1 Institute of Solar-Terrestrial Physics of Siberian Branch of RAS, Irkutsk, Russia
The ionospheric phenomena during sudden stratospheric warmings (SSWs) of 2008-2009 and 2012-2013 winters, in the Asian region of Russia have been studied. To identify the ionosphere perturbations, most probably related to the SSWs, a joint analysis of the total electron content (TEC) global ionospheric map data, the measurements of temperature vertical profiles, obtained by the Microwave Limb Sounder (EOS Aura), as well as of the NCEP/NCAR Reanalysis archive data was carried out. It was revealed that during strong SSWs the reduction of the diurnal TEC variation amplitude is observed in the mid-latitude ionosphere. It was established that during the SSW peak, the midday TEC maximum decreases and the night/morning TEC grows relative to quiet day values. It has shown that the dynamics of TEC deviations from the background level during SSWs is different depending on the observation point location: positive deviations of TEC are registered at points located within the stratospheric cyclone, negative - inside anticyclone. These effects are likely to be associated with the vertical transfer of molecular gas from the stratospheric warming zone, leading to a decrease/increase of the electron concentration in different areas. After the main stage of the warming, a rapid increase in TEC values, not connected with the geomagnetic activity, is observed in the ionosphere.
Keywords: ionospheric disturbances, GPS TEC, Sudden Stratosphere Warming
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