... Laboratory . ... webmaster@izmiran.ru . ... Thus, at low solar activity, the dynamics of the equatorial wall at high altitudes sharply differs from its dynamics at altitudes of the F2 layer. ... The revealed dependences of the MIT shape on longitude and hemisphere make it also possible to eliminate some contradictions between different studies based on different data sets. ... Thus, the problem of MIT shape variations with magnetic activity cannot be solved merely by averaging data. ...