ИСТИНА

Precipitations of electrons with energies of tens to hundreds keV from the outer radiation belt (ORB) over Asian Sector were investigated. The precipitations affect mainly the upper atmosphere and the bottomside ionosphere (D and E layers) at high latitudes. Intense precipitations during magnetic storms disturb the mid and low latitude ionosphere. It was found that most intense precipitations were observed during solar maxima and in the middle of declining phases. In the solar minimum 2009, the ORB precipitations are weakest and situated at highest latitudes. It was found that the precipitations are mainly weaker during the current 24th solar cycle than during the previous one. During the solar maxima, the ORB shifts equatorward. The ORB has a prominent secular trend of about 3 – 4 degrees per 20 years. This fact might indicate an acceleration of changes in the geomagnetic field in the Asian region.