PROBLEMS OF GEOCOSMOS

Proceedings of the 7th International Conference "Problems of Geocosmos" (St. Petersburg, Russia, 26-30 May 2008)
Fig. 3. The calculated by using the UAM with the NRLMSISE-00 latitude-longitude distributions of the ionospheric
F2-layer critical frequency f0F2 (MHz) (left column) and the meridional cuts of the Lg(ne, m -3 ) along the magnetic
meridian MLT=00:30 in the altitude range from 200 km to 800 km (right column) are presented. The variants of the
model calculations are presented top-down: 1) Vnx=0; 2) Vnx =10 m/s; 3) Vnx =50 m/s; 4) Vnx =100 m/s.
Conclusions
Thus the analysis of the results of the model calculations of the ionospheric F2-layer electron density
allows making the following conclusions.
1) It is confirmed that the main cause of the occurrence of the night-time enhanced electron density
regions is the equatorward thermospheric wind.
2) The latitudinal locations of the EEDR’s and maximum of the vertical ion velocity induced by the
meridional wind does not coincide in both cases: when the meridional wind is constant and it is
variable with the latitude.
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