Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

Validation o fthe model IRl - 2007 by the latest experimental data in auroral ionosphere In variations of maximal electron density of F2 ionosphere layer we can allocate 3 periods (Figure 3): I - September - November 2009 (autumn) II - December 2009 and January 2010 (winter) III - February 2010 (spring) Figure 3 Variations and periods o fsimulation results and real sounding data fo r the maximal electron density o f F2 layer. In winter season there is rather good agreement between IRI-2007 and ionosonde data. But in autumn and spring, when photochemical processes takes place, we get worse results. For the numerical estimation of differences between IRI-2007 simulation results and real ionospheric sounding data was calculated Spearman rank correlation coefficients (Table 2). Table 2 Spearman rank correlation coefficients between model and real for maximal altitude of F2 layer (HmF2), maximal electron density of F2 layer (NmF2) and maximal electron density of E layer (NmE)____________________ 10 LT 11 LT 12 LT 13 LT 14 LT 15 LT HmF2 0.49 0.31 0.44 0.33 0.23 0.46 NmF2 0.83 0.67 0.64 0.66 0.76 0.80 NmE 0.95 0.96 0.96 0.97 0.97 0.98 Correlation analysis also shows good agreement in maximal electron density of E layer and worse in maximal altitude and electron density of complicated F2 layer. This difference can be explained by the unrecorded values of electric field in IRI. Epoch of 2009 is characterized by extremely low level of the solar activity which was expressed in complete absence of the sunspots as well as by very low values of parameters of the solar wind (its magnetic field, density and velocity). Such very low level of the solar activity was responsible for not ordinary changes of neutral atmosphere and for comparatively low intensity o f the ionospheric electric fields which results in the low values of HmF2 and NmF2. Influence o f the solar activity on the neutral atmosphere is a subject of many studies. It is established that decrease o f the solar activity makes the thermosphere denser, while during years of maximum of solar activity the thermosphere becomes to be more rarified [2]. However influence o f the electric fields on dynamics of ionosphere was studied only recently. The distribution o f the electric fields in ionosphere depends on the energy of solar wind and its parameters. Experimental data analysis shows that maximal altitude of F2 layer is associated with solar wind total magnetic field magnitude (Bsw). Availability o f long term experimental data of ionosphere were using for study connection HmF2 with full vector of the magnetic field o f the solar wind which is connected with large magnetic fields of the Sun. Linkage between full vector IMF and altitude o f maximum o f F2 layer indicates physical mechanism of these parameters connection. Such physical mechanism can be electric drift of F2 layer under influence of electric field which is connected with IMF. Average annual values o f Bsw were higher than 5 nTl during all the period except of the last few years for period from 1965 year till 2007 years (Figure 4). 127