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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 107-117

Variations of O+/H+ transition height over East Siberia from Irkutsk incoherent scatter data and GPS total electron content

D.S. Khabituev1 , B.G. Shpynev1 
1 Institute of Solar-Terrestrial Physics of Siberian Branch RAS, Irkutsk, Russia
In the present work we investigate the topside ionosphere electron dynamics on the basis of previously developed method of transition level O+/H+ determination, which combines the Incoherent Scatter Radar (ISR) experimental data and GPS TEC data. As the model we use modified Chapman function where O+/H+ transition level is used as parameter. Distinct from the commonly used transition height model, we include into consideration an additional parameter - transition area scale height. This new model gives very realistic description of Arecibo ISR experimental data, where oxygen and hydrogen ion distributions were measured directly. In practical use of the model the shape of transition area does not affect the final result, and transition height can be derived from ISR-GPS data. On the basis of this technique we conducted investigation of seasonal and daily variations of transition height O+/H+ for periods of high solar activity during equinoxes and solstices of the year 2002. We investigate the daily dynamics of transition height and plasmasphere electron content contribution to GPS TEC in different geomagnetic conditions. It is shown that in solstices conditions the plasmasphere electron content can contribute as much as 50% to GPS TEC, and the input from plasmasphere can produce significant influence on GPS TEC variations. Some peculiarities of O+/H+ transition height variations cannot be explained only by the solar and geomagnetic activity. We consider these events as the result of the plasma flux, associated with neutral thermosphere wind regime.
Keywords: topside ionosphere, transition height O+/H+, TEC GPS
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